5 Best Lab-Created Diamond Companies in Miami

The best lab-created diamond companies in Miami differ more in how they work than in the diamonds they sell. 

One designs rings from scratch, one keeps ready-made rings you can take home the same day, and the others focus on large stones, tennis bracelets or a luxury store setting. 

All five have a showroom in Miami-Dade where you can see lab-grown diamonds in person before you buy.

Quick Comparison of Miami Lab-Created Diamond Companies

Each company suits a different kind of buyer.

Frank Darling: Best for a Custom-Designed Ring (South of Brickell)

Best for: couples who want a ring designed from scratch instead of chosen from a display case.

Frank Darling opened its first Southeast showroom at 2700 SW 3rd Avenue in 2026. Most of its business is custom work. JCK, a jewelry trade publication, reported that about 60 percent of the company’s sales are custom. Most other orders are existing designs with small changes, such as added side stones or engraving. 

The company is known for modern engagement rings, especially bezel and low-profile settings, and it sells both lab-grown and natural diamonds.

Appointments last about 45 minutes. One designer works with you from the first sketch to a 3D model, and you approve the model before production starts. You can also order a kit of replica rings to try styles at home first. 

Customer reviews often name the designer and describe the design process step by step. Frank Darling is the best fit on this list when the design matters more to you than how quickly you get the ring.

Brilliant Earth: Best for First-Time Buyers (Coconut Grove)

Best for: buyers who are new to diamonds, or anyone who needs a ring soon.

Brilliant Earth’s showroom at 3008 Grand Avenue accepts walk-ins, so you can start here without an appointment. Walk-in visitors can try on rings in the lobby, but you need to book ahead to see loose diamonds. 

Brilliant Earth suits buyers on a deadline. Some popular rings come preset with lab-grown diamonds and can be bought and taken home the same day, while custom designs take two to three weeks.

On Trustpilot, Brilliant Earth has a 4.1 rating from about 1,500 reviews. Reviewers praise staff who give advice without pushing them toward a bigger budget. Some report that their orders arrived later than promised, so leave extra time if you have a proposal date planned.

Kirk Jewelers: Best for Evening and Weekend Shopping (Brickell)

Best for: people who work in Brickell or downtown, and buyers who want a traditional luxury store.

Kirk Jewelers is at 701 S. Miami Avenue, on the third level of Brickell City Centre. It is open until 8 p.m. Monday through Thursday, until 9 p.m. on Fridays and Saturdays, and from noon to 7 p.m. on Sundays. 

Kirk is an authorized Rolex and Patek Philippe retailer and also sells natural diamonds and designer fine jewelry, so lab-grown diamonds are one category among many. That mix suits a buyer who wants an engagement ring and a watch from the same store.

If you only want lab-grown diamonds, Karaters sells nothing else.

Liori Diamonds: Best for Large Center Stones (Sunny Isles Beach)

Best for: buyers who want a large diamond, and shoppers in North Miami-Dade.

Liori is a Fifth Avenue jeweler with a Miami showroom at 16850 Collins Avenue in Sunny Isles Beach. It sells lab-grown and natural diamonds side by side, and its catalog includes rings with lab-grown center stones of four carats or more. 

In one visit, you can see how a large stone looks on your hand and compare lab-grown and natural prices for diamonds of the same size. Customer reviews often name founder Avi Aranbaiev and say he worked with them directly, and some reviewers say they came back for a second purchase.

Karaters: Best for Tennis Bracelets and Diamond Gifts (Near Aventura)

Best for: gift buyers and anyone shopping for diamond jewelry other than an engagement ring.

Karaters, at 19790 W. Dixie Highway near Aventura, sells only lab-grown diamonds. It describes itself as a wholesaler and sells loose stones as well as finished jewelry. 

Most of its roughly 90 Trustpilot reviews are about tennis bracelets and necklaces, many between 5 and 15 total carats, and reviewers frequently mention low prices. For a one-of-a-kind engagement ring, a design studio is a better match.

How to Compare Lab-Created Diamond Sellers in Miami

Lab-grown diamonds are now widely traded. They have their own buying category at JIS Fall 2026, the jewelry trade show at the Miami Beach Convention Center. 

Prices for the same grade can differ from one store to the next. Ask every store to quote a stone with the same carat weight, color, clarity, and cut grade.

Ask for the grading report, and look up the report number on the lab’s website to confirm it matches your stone. Read the label as well. Under FTC guidelines on diamond advertising, sellers should put a word like “lab-grown” directly before the word “diamond.” Sellers also should not call a stone “eco-friendly” unless they can prove the claim.

After you buy, get an independent appraisal for insurance. The Seybold Jewelry Building downtown has offices for many independent appraisers.

Choosing the Right Lab-Created Diamond Company

Decide what you are buying before your first visit. A custom ring, a same-day ring, a large center stone and a tennis bracelet each point to a different store on this list. Bring the same diamond specifications to at least two of them so you can compare prices fairly.

By ML Staff