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CDI Diamonds & Jewelry Columbus, Ohio

CDI Diamonds & Jewelry is owned and operated by Matt Carlozzi Jr. Formally of Youngstown, Ohio where he owned and operated a jewelry manufacturing and loose diamond wholesale business which featured his patented loose diamond design. Formally Bernie Helmick Diamonds & Gold, CDI has been serving the Columbus area for over 20 years. During this period, CDI has become known for offering the absolute best prices and qualities on certified loose diamonds & engagement rings as well as providing the best customer service with a no-pressure sales approach as supported by their over 400 5 star Google Reviews. CDI also specializes in Diamond Wedding Bands & Jewelry, designer sterling silver collections, expert jewelry repair, custom design and complete appraisal services provided by their in house Graduate Gemologist. With over 90 years of combined jewelry experience, we guarantee you will not be disappointed!

See Inside CDI

Read our Google Reviews

CDI Diamonds & Jewelry
5.0
Based on 415 reviews
powered by Google
George Lyras
George Lyras
13:10 20 May 20
Matt is amazing. He helped me get the perfect diamond for my fiancé. and we were on a short schedule and he did it in such a quick time. highly recommend Matt for everything. Thank you Matt truly appreciate the help!
jordan johnson
jordan johnson
18:14 15 May 20
CDI Diamonds is truly an amazing company. Their customer service was spectacular and their quality is bar none. I highly recommend them to anyone interested in their jewelry endeavors. I cannot thank Matt enough for his diligence, care, honesty, and integrity throughout the process. Thank you CDI!
diana hart
diana hart
17:28 15 Apr 20
Exquisite jewelry and outstanding service is what you will find here at CDI jewelry. We were so impressed with my engagement ring and the service we received we returned my fiancees' wedding ring which we purchased at another store to purchase one from Matt! My finger was difficult to size the ring to, but Matt found a way and the turnover time was quick. It's now perfect! If you are looking for truly beautiful jewelry at a fair price, coupled with outstanding heartfelt service. You need to look no further than CDI. Thanks Matt! We will be back for sure!
Heidi Rudibaugh
Heidi Rudibaugh
16:26 11 Mar 20
My experience with CDI was 5 stars all the way. I wasn’t sure what I was looking for, but Matt’s knowledge of diamonds and designs led me to the perfect ring! Matt was kind and patient throughout the entire process. I couldn’t be happier and would highly recommend shopping at CDI. If you’re looking for a unique design, CDI is the place to go.
doug lampert
doug lampert
18:19 06 Mar 20
Great experience at CDI every time I go. The staff is great and I didn't even consider going anywhere else when making the most important purchase, an engagement ring for my new fiance. Although I did look and compare prices online before going just to see what was realistic. Matt went above and beyond and found the perfect diamond. She gets compliments every time we're out. Most importantly, she said yes and loves it.
Janice Hogan
Janice Hogan
21:18 26 Feb 20
My husband, Scott and I have had several dealings with Matt at CDI and have never been disappointed. He always goes the extra mile to make sure we’re happy with our purchase whether it benefits him personally or not. He’s definitely a man Of his word. My jewelry speaks for itself - all beautiful pieces of high quality.
Kate Blankemeyer
Kate Blankemeyer
20:01 26 Feb 20
CDI were great to deal with! Very accommodating and knowledgeable staff! My husband and I went in on Super Bowl Weekend when they had a fantastic sale going on . We walked out with a beautiful diamond ring! Great quality and sooo elegant! I totally recommend CDI
Sophie Conway
Sophie Conway
16:38 26 Feb 20
My finance just got my ring from here. It is my absolute dream ring! And he definitely got a steal because they were very accommodating with the price. I would recommend this place to anyone on the hunt. The team has been so kind and polite every time I’ve been in the store. I am so satisfied with the quality of the ring and the store!
Kevin Larivee
Kevin Larivee
21:24 16 Feb 20
What a fantastic experience. Fantastic customer service, great selection as well as the best value for my money. Shopped many stores in the area and ended up here. Will definitely be back and recommend everyone I know. Thanks CDI!!!!
Navid Ahmadian
Navid Ahmadian
18:40 12 Feb 20
I had a great experience purchasing a rose gold chain, I was looking for it at different stores and I finally found it here. Matt is really kind and helpful, he helped me find the right chain and ordered it to be made the way I wanted. They also kindly wrapped it as a gift. The quality of their products is very high and I highly recommend it.
Robin Tackett
Robin Tackett
16:53 28 Jan 20
Wow, what a great team. I have had several repairs done at CDI. They do an amazing job, turn things around in a very reasonable amount of time (usually less than a week). I highly recommend them, and I will definitely be using them for additional repairs. Also - (the only warning) I bought the most amazing ring while in and out for repairs. They are there to help. not pushy, and have creative ideas if you are looking to change your jewelry up.
berry james
berry james
22:33 23 Jan 20
With big purchases (like jewelry), you want to ensure you trust the people you are buying from. I have been coming to CDI since I moved to Columbus 6 years ago. I stopped back in a few weeks ago, and I remembered why we purchased here in the first place. They really do treat you like family! Honest, down to earth, good people. If you are dealing with Matt or Ernie, you are in good hands.
Oldfield's OSU
Oldfield's OSU
05:13 15 Jan 20
Ernie took me under his wing, taught me all the basics, coached me into purchasing the perfect ring. I HIGHLY suggest Ernie to any guy who has NO CLUE what he's doing (Like me!) Go see Ernie if you want the personal touch and friendly smile.
Andrew Tirpak
Andrew Tirpak
16:35 12 Jan 20
Had a great experience purchasing an engagement ring with CDI! Matt shared a great deal of knowledge while giving me several high quality options to choose from. I felt like I was treated like family and walked out of the store with the perfect ring. After such a good experience, we will definitely be returning to CDI to shop for wedding bands. I highly recommend the folks at CDI to anyone in the greater Columbus area!
Patrick Wilson
Patrick Wilson
18:13 06 Jan 20
Huge thanks to Matt and the entire CDI team. They did a great job of explaining everything from A to Z, without making me feel pressured to buy anything or go out of my price range. The ring was absolutely stunning and they were extremely transparent throughout the whole process. I highly recommend CDI and will continue to use them in the future. Thanks again!
Wren G
Wren G
16:39 03 Jan 20
I had never been to this business, but won a gift certificate where they were a sponsor. When I entered, I was greeted by Ernie and was treated very well. He took plenty of time to ask for preferences. Then he showed me plenty of choices. I felt very comfortable with him and was easily able to choose my favorites. I waited a week or 2 before writing this to make sure I was still happy with my choices - I LOVE the ring and necklace I chose and have received many compliments! Thanks, Ernie!
Kevin Maun
Kevin Maun
19:29 19 Dec 19
Wow, what an excellent experience. Creative and knowledgable, the staff helped me solve a problem with a gold allergy and a necklace with significant sentimental value. They managed to emulate the original pendant in platinum. The work was excellent and delivered well ahead of their estimate. I couldn't be more pleased and I'm excited to work with CDI again.
anonda ringger
anonda ringger
00:19 13 Dec 19
The work I had done was miraculous! My seventeen year old wedding set was brought back to new again! I had pearls on a gold bracelet that they matched perfectly! These gentleman know what they are doing. Please go and see them for all of your jewelry needs. Thank you!
Donna Eudell
Donna Eudell
15:34 07 Dec 19
I have been married for over 28 years and is on my second wedding ring. My first wedding ring has been sitting in my jewelry box for over 18 years. We decided about a month ago to to repurpose the ring. I went to CDI Diamonds and Jewelry and the minute I walked in the door, they were so friendly and helpful. They suggested the perfect option and design for my ring. I love my new diamond necklace and earrings. Thank you so much!
Robert Brooks
Robert Brooks
22:12 06 Dec 19
After 8 years of dating we decided to get engaged. We armed ourselves with the 4c's and all the info we could. We had a pic of what setting we wanted and took off looking in stores and on the web. Absolutely no luck. Nothing close to the setting and the diamonds were really cheap or really expensive. I Googled loose diamonds and CDI popped up. Great! A jeweler in $$Dublin$$. Let's go see how expensive they will be! From when we walked in the door, we were treated like we were shopping for a 50k ring. Our budget was well under the national average tho. We told and showed them what we wanted. They went to work on the phone and on the web and found a setting that was perfect. Matt (Owner) then explained our options for diamonds in our budget. He was amazing. This all happened in less than 40 minutes from walking in the door. 2 days later we went back and looked at the setting and stones. Matt told us if we didn't like something, we'll keep looking. (No pressure to buy at all). But we loved everything. 1 week later. We went and picked our engagement ring up. BEAUTIFUL!!! Matt and Ernie made this buying experience so smooth. Thank you guys so much!
Louis Lobello
Louis Lobello
17:07 12 Nov 19
I would recommend CDI to anyone searching for an engagement ring. I walked in to with little intention on buying a ring that day and walked out with the perfect ring and a great deal of knowledge on diamonds and settings. Matt was great with taking the time to walk me through every little detail about picking out the perfect ring for my fiance. Plus, the prices are unbeatable. I'm happy to support a local business doing things the right way.
Alysia Petite
Alysia Petite
15:47 04 Nov 19
CDI is the place to go for fine jewelry. There prices are unbeatable. The staff are friendly and knowledgeable. I've already sent a couple of friends who also loved their experience.
JESSICA TEEGARDEN
JESSICA TEEGARDEN
00:54 01 Nov 19
Doesn’t get better than this. The kindest service with impeccable integrity. Exquisite pieces & one of a kind selections. I won’t go anywhere else. My jewelers from now on. Absolutely above board. Every. Single. Time.
Christopher Fox
Christopher Fox
21:20 29 Oct 19
Jay, Matt, and Ernie made my fiancé and I feel right at home when we walked through the door. They were very accommodating to our needs and worked with us to make sure we felt comfortable with our choices. They were all very nice and were able to provide us with general info about engagement rings. It was easy to tell that they were genuinely invested in us making the best choice rather than just simply attempting to make money off of us. They even knocked down the price for us. Great experience and definitely recommend these guys!
Mike Woytek
Mike Woytek
15:20 24 Oct 19
Dublin is so fortunate to be home to CDI Diamonds & Jewelry. Matt Carlozzi is a seasoned jeweler who puts the customer first, as it should be! I have relied on Matt's expertise for almost 40 years. Thanks again for helping me pick an outstanding anniversary gift!!
Olivia Loughridge
Olivia Loughridge
14:21 02 Oct 19
I went to CDI to get my rings appraised for insurance purposes, and they were awesome! Not only did they take less than 24 hours, but they also were less expensive than other jewelry stores I called! They also cleaned my pieces for free. I will definitely be back to purchase jewelry and have my rings cleaned in the future! The guys who work there are very nice and helpful as well!
Hugh White
Hugh White
14:34 21 Sep 19
Great buying experience! High quality, fair prices, but no high pressure sales. Matt and his team do a fabulous job.
Andrew McGonagle
Andrew McGonagle
22:53 12 Sep 19
I recently visited per a referral and absolutely loved the store and associates. I wanted to have my wedding set rodium dipped due to it being white gold and turning gold. I also had a band that was missing a few diamonds. They took care of it all. I will never deal with a big box store for diamonds going forward and feel that I have found my trustworthy place!
Scott Dredge
Scott Dredge
18:06 10 Sep 19
I recently celebrated my 10th wedding anniversary and decided to go to CDI Diamonds & Jewelry off of Perimeter Loop in Dublin to get my wife’s ring and band dunked and cleaned. The service was excellent and my wife was thrilled with the finished product. The ring and band were finished in a timely fashion and came back looking exactly like the day I purchased them. Give them a try, you won’t regret it. Scott
Erin Coane
Erin Coane
14:50 04 Sep 19
Ernie took great care of my watch strap and battery replacement. He also did a wonderful job of shining up my rings while I waited. I would recommend stopping and taking a look at their lovely jewelry shop!
Audra Mattson
Audra Mattson
19:05 29 Aug 19
After our wedding in the summer of 2016, my husband and I went and picked out a new ring set for me so we could save my original rings. It was a great experience and I absolutely fell in love with the rings we got. However, a diamond recently fell out of my wedding band, which happens - not a big deal, so we went to visit CDI. They replaced the diamond and re-dipped my ring for free. Both rings look brand new and I am in love all over again.
Connie Swartz
Connie Swartz
17:00 20 Aug 19
All I wanted for my birthday was to have my 35 year old cross necklace cleaned. It was terribly dirty since I wear it 24/7. My husband just happened to see the sign and so he took it in without a lot of hope. They spent almost 30 minutes on it - and it was free cleaning. Looks really nice. I plan on visiting them to go shopping soon
Jo Raymond
Jo Raymond
17:20 19 Aug 19
I am very pleased with my experience at the Dublin CDI. I had lost a small diamond in my ring and had another jewelry store estimate what it would cost to repair it. The price was exorbitant. My daughter had been to CDI and was pleased so I decided to give it a try. Their price was far less, the time it took them was also less. They delivered the day they promised and my ring looks gorgeous. And, unexpectedly, they even volunteered a 25% discount when I picked up my ring. They will definitely be my jeweler of choice from now on.
sameer lengade
sameer lengade
18:04 10 Aug 19
Now I have been in CDI twice. My wife's wedding ring and band were such an easy shop a couple months ago. I went in with my budget and Ernie and Matt made things happen. They had a rock on hand that my wife loved. Custom job with the band and she was so happy. Of course I can measure their success in her smile. I also came back to CDI a couple months later to replace my wedding ring. Ernie made it easy and we were done in a couple minutes. I love my new band and the quality is excellent. Thanks CDI. Financing was easy and we will be back.
Katie Peplin
Katie Peplin
21:11 09 Aug 19
I absolutely love this place! My fiancé bought my engagement ring here 2 years ago and it was exactly what I wanted. Here I am 2 years later and a diamond fell out of my band (for my lack of caring for it) and Matt and Jay could not have been more helpful to get my ring fixed. Wonderful customer service, great prices, and beautiful jewelry! Thanks CDI. You’re the best!!!
Jp Zelik
Jp Zelik
11:40 29 Jul 19
Ernie was extremely helpful in my search for the perfect engagement ring! The CDI Team is very knowledgeable and Ernie took the time to explain to me not only details of diamonds in general, but also provided great detail on the specific diamonds I was looking at and the one I ultimately chose. Thank you!
Luke
Luke
18:35 26 Jul 19
Ernie worked with us to find the perfect engagement ring. We told Ernie what we had in mind, and he was able to put together a custom ring for us at a great price. If you want your search for an engagement ring to be seamless, CDI is the place to go.
Lissa Marie
Lissa Marie
15:47 15 Jul 19
My new, favorite, highly recommended jeweler. Got my watch (link) adjusted and battery replaced; also my wedding band/ring resized and all channels repaired, having set soldered... looks absolutely beautiful! Thank you so much, Ernie & Matt for your expertise and personable service.
Erin Shafer
Erin Shafer
01:07 28 Jun 19
I took my engagement ring to CDI to be appraised. The staff were super kind and helpful. They had the best prices out of anyone I called and even offered to do same-day appraisal if I dropped it off early in the day. When I came back to pick my ring up, he explained the appraisal to me and sent me home with an insurance recommendation and some jewelry cleaner! Thanks CDI!
Indranil Majumder
Indranil Majumder
23:09 13 Jun 19
Our CDI experience was absolutely wonderful! Matt was very nice to work with, he knew exactly what we were looking for. The first day we were there, he showed us some diamonds and settings. We told him that we liked a couple of the stones and mounts, but didn't tell him the exact combination. Once me and my wife decided which combination to buy, we went back to the store and guess what?? Matt had already sent the diamond and ring to be finished (before we even confirmed and paid for it), he said we could pick it up the next day. He was so confident of what we would decide on that he didn't even wait for us. He was absolutely right! We were very impressed, it definitely shows that he knows what his customers want.
Adam Sizemore
Adam Sizemore
01:27 11 Jun 19
Such a wonderful store to bring my happiest day to life. I had only a vision in my mind and this team was able to bring it to reality. I know its hard to believe but the final product was even better than I could have imagined. Thank you CDI team!!!
Terri Roehrenbeck
Terri Roehrenbeck
02:10 30 May 19
I recently noticed the prongs on my wedding ring were snagging thing so I took it to CDI to be fixed. When Ernie called me to say the ring was ready fo pick up he also told me to bring my other rings in and he would clean them. My wedding ring looked like new and the other rings sparkled after a professional cleaning. I am very happy with CDI as the cost of repair was very fair and everyone in the store could not have been nicer. I highly recommend this jewelry store.
Pat Halpin
Pat Halpin
14:41 23 May 19
Wonderful! We had a wedding band made for my wife to match an existing band that she had. We were blown away with the results! Not only does the band look great, it matches the other rings in the set so well. The whole ring looks like it received a facelift. The team at CDI was so helpful as well and the timeline they gave us for the finished product was spot on. We highly recommend and will most certainly be going back.
Brian Carothers
Brian Carothers
22:15 19 May 19
Matt and his team are the best in the business. I contacted him in the early stages of engagement ring shopping (knowing nothing about jewelry when I did) and immediately went from feeling overwhelmed to excited. He was patient, thorough and worked with me to come up with a BEAUTIFUL custom ring. Don't waste your time going to one of the big chain jewelers. CDI provides top notch service with value and excellence that other jewelers don't come close to. Thank you for everything!!
Nick Dodson
Nick Dodson
14:46 13 May 19
Amazing experience!!! I am not sure what I would have done without Matt and his incredible staff. Buying an engagement ring is a very nerve wrecking experience, especially for someone like myself who has zero experience buying any type of jewelry. Matt gave me all the information I needed while teaching me all the ins and outs of how to look at and determine the worth of each diamond. He was knowledgeable and helpful with every aspect of my experience of buying and engagement ring. Thanks again to Matt and his amazing staff!!!!
Karriann Wood
Karriann Wood
14:55 19 Apr 19
Matt and Ernie are so amazing! They had the exact necklace I wanted, and I walked out with another diamond necklace and a unique diamond ring! Their selection was beautiful and their customer service was outstanding! Also, they sized my ring really fast so I could take it on vacation! Matt and Ernie both treated me like I’ve known them for years! I highly recommend CDI for all your jewelry needs!
Lisa P
Lisa P
16:32 22 Mar 19
Matt was very helpful in assisting my fiance in choosing my engagement ring, which I often receive compliments on. They knew I wanted something simple, yet the ring is so elegant and unique. We could not have asked for a better product or service. We recently visited again to choose wedding bands, and there is a large selection of jewelry for other occasions as well. I would highly recommend CDI.
Kristi Samples
Kristi Samples
01:57 15 Mar 19
Everyone at CDI has always been helpful, friendly and professional. Their beautiful selection of jewelry is top notch and they always go above and beyond my expectations with customer service. I have had multiple rings sized and cleaned and each time they come back looking brand new. 13 years ago my husband and I picked out our wedding rings and bands and we have been going back for any of our jewelry wishes since. I highly recommend CDI to anyone looking for a beautiful piece of jewelry and terrific customer service.
Kelly Miller
Kelly Miller
17:50 24 Feb 19
GREAT experience! Highly recommend! If you are looking for an engagement ring, need expert jewelry advice, want patience in selecting the perfect diamond or band, or are looking for any type of jewelry or repair, this is your place. We went to all the big name places and am so grateful to have run into CDI. My fiance and I had picked out an engagement ring online together and it was pretty, but not exactly what I had in mind. So, we decided to go a different route. I had received my mom's diamond from her engagement ring, and had a pair of diamond earrings from her as a gift, both in yellow gold. My heart was set on a white gold, trellis-style 3-stone ring all along, so I spoke to the manager, Ernie, at CDI and he found the perfect mounting online to set my 3 stones in. It only took about 1 week to receive my new ring, it was extremely reasonably priced for the mounting and labor, and is ABSOLUTE GORGEOUS!!! Everyone at CDI is friendly, professional, knowledgeable, and you never feel pressured or rushed. GO HERE...trust me. They will have what you need, or will get it for you, have great quality items, good sales, and will give you a fair price. HIGHLY RECOMMEND!!!!
Dilshad Tolliver
Dilshad Tolliver
20:57 14 Feb 19
After my husbands passing in 2015, I wanted to keep the wonderful memories of him and our love- my wedding ring. I walked into CDI diamond store and wanted to convert my ring into something I could wear everyday. They helped me design another ring with it along with some unique earrings. I was so happy and cried after I left there. This was an emotional decision and they made it so memorable. I would recommend this store to anyone that is looking for some jewelry for their loved ones. Thank you!
Michael Thomas
Michael Thomas
15:08 11 Apr 18
I dealt with Matt and I could not have had a better experience. I had little to no idea what I wanted/needed when buying an engagement ring and he walked me through the entire process. He was there to take my calls, answer emails in a timely manner and understood that this is a big purchase and took the time to find the right diamond. Matt never once tried to push me into something I didn't want just to close the sale early or buy something I didn't need. He is a true professional and I had a great experience dealing with him. On top of all of the great customer service, the diamond is beautiful and price was unbeatable. I highly recommend CDI.
Cameron Sheehan
Cameron Sheehan
13:47 11 Apr 18
To start, I am a medical student on a budget who was looking for the perfect engagement ring. I went to roughly 6 diamond stores before coming to CDI. Before this store, I felt like I wasn't being taken seriously because of my budget and no one really made time to help me. After getting drowned in thousands of rings with Halos, I finally stumbled upon CDI who gave me the freedom to completely customize the ring you see below. Matt ordered a few diamonds with my specifications/price range and gave me the opportunity to pick everything for myself. I would highly recommend this place to anyone and already have friends who will be visiting in the upcoming weeks. Thanks for everything Matt and team.
Gabrielle Gaglione
Gabrielle Gaglione
16:14 05 Apr 18
My fiancé got my engagement ring here and it’s absolutely beautiful. I wanted something a little different and what he received from them was just perfect. I get compliments all the time on my ring . My main request was it to be rose gold and sparkly and it definitely fits that bill. The customer service is great and they were very willing to resize my ring when I wanted it a little tighter. We will both be getting our wedding bands here and I can’t wait to see how they turn out !
amanda despo
amanda despo
13:52 30 Mar 18
When my fiance put the engagement ring on my hand, I cried. We were promising a life together full of love and adventure. Every moment was perfect especially the ring! I could not have picked out a better setting than my fiance did. I absolutely love my ring and I am still blown away by its beauty. We cannot wait to come back to CDI Diamonds & Jewelry to pick out our wedding bands! Thank you all so much for guiding my fiance through the process and helping him pick out the perfect ring!
Pulcritudiness Princess
Pulcritudiness Princess
23:13 26 Mar 18
My fiancé purchased my engagement ring and wedding band from CDI diamonds & jewelry, I can't fathom any jewelry store doing a better job. Believe me I've tried. They were not only consistent with getting back to me on my concerns in a timely manner, they made sure that I received the ring of my dreams, the exact way I dreamt it. In other words, "dreams come true at CDI DIAMONDS & JEWELRY." I could go on and on about their professionalism, promptness, humanly kindness, consideration and amazing prices. I won't. Here's the beaut in person. Go see for yourself!
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