Lab-Grown Diamonds: Knowing What You’re Getting

All signs indicate that the lab-grown diamond’s market share will continue to grow. This assortment lets you offer customers more options — with lab-grown, customers can choose a better color or larger diamond for the same price as a natural diamond. Lab-grown diamonds often give you a better margin, a novelty in diamonds. 

CanadaMark Melee Diamonds

Unparallel Lines

Unfortunately, the influx of lab-grown diamonds to the market raises a dilemma. Thousands of undisclosed lab-grown diamonds (ULGDs) — particularly melee — find their way into the vast streams coming out of diamond hubs today. So how can you know for sure if the diamonds and diamond jewelry you order is natural or perhaps a ULGD?

Choose Certainty

Stuller has a Zero Tolerance Policy for ULGDs, so when you purchase from Stuller, you have absolute certainty and can share that trust and confidence with your customers. We screen every colorless and near-colorless loose diamond and piece of diamond jewelry that enters our manufacturing facility — no exceptions. Our approach to screening ULGDs uses the most sophisticated and effective technology in the industry, so you can rest assured that when you order a natural diamond, that’s what you’ll receive.

Natural Round Melee Diamonds

We have a strategic service arrangement with GIA® (Gemological Institute of America), a separate entity from Stuller. The independent Melee Analysis by GIA lab in Stuller’s Lafayette facility has GIA specialists who use proprietary technology to screen round melee diamonds in sizes of 0.005ct through 0.24ct – our best sellers! After screening, their technology sorts the stones based on color grade, the industry benchmark. When ordering GIA-screened melee, a customer will receive their diamonds in a gray parcel sealed with a GIA sticker along with an assurance card, for easy identification.

GIA Melee Lab-Grown Diamonds

Eye-Catching Blue

We store and ship LGDs in distinct blue packaging. Lab-Grown Diamonds will arrive at your door in a blue parcel. Lab-grown diamonds weighing 0.33ct and larger come with an assurance card notating the inscription on the girdle and that they have been screened by the Stuller Gemological Lab. If we are setting jewelry with LGDs, the diamonds travel from workstation to workstation in a blue work sleeve alerting all associates who work on the jewelry piece that there are lab-grown diamonds inside. 

Do We Stop There?

Not even close. As added security, we further require our suppliers to screen all diamonds for lab-grown diamonds. Random samples of diamonds from all our suppliers are also periodically sent out to leading laboratories to check for lab-grown diamonds. These protocols let Stuller extend confidence and security to you, ensuring you get precisely what you purchase.

Stuller’s strategic partnership with GIA helps us ensure that you’re getting exactly what you order every single time. Our industry-leading processes help to ensure that we keep track of each stone we handle and that we are as fully transparent from the time of purchase through to delivery.

Third Anniversary of GIA’s Strategic Service Arrangement With Stuller

GIA Melee Analysis Service Blog Header

We’re celebrating the third anniversary of Stuller’s strategic service arrangement with GIA — the Gemological Institute of America® — at its Lafayette, LA facility. Melee diamonds, which weigh less than 0.2 carats, are dazzling accents in many pieces of jewelry and watches. In addition to natural melee, there are many laboratory-grown and simulated melee diamonds on the market. However, these sometimes get mixed in with parcels of natural diamonds.

How can a jeweler know for sure that their diamond from Stuller has been screened and is indeed a natural diamond? The answer is Melee Analysis by GIA®. In 2018, GIA brought this fully automated service onsite to Stuller. An advanced instrument developed through decades of GIA research sorts diamonds by identity, diameter, and even color range. Once sorted, each melee result type is provided back to Stuller.

When ordering GIA-screened melee from Stuller, you will receive a gray parcel sealed with a GIA sticker that signifies that your diamond has been screened by Stuller’s in-house GIA Melee Analysis service.  

One huge improvement to this arrangement at Stuller is the addition of a second GIA screening machine. This allowed GIA to handle Stuller’s large melee volume. In total, GIA has evaluated more than 6.5 million melee stones for Stuller through this arrangement. The goal is to give consumers confidence when purchasing natural melee diamonds — the most prevalent stones on the market. This arrangement serves GIA’s consumer-protection mission of ensuring public trust in gems and jewelry.  

Stanley Zale, Stuller’s vice president of diamonds and gemstones procurement, believes that “a strong, continuous collaboration between Stuller and GIA leadership provides unparalleled confidence as GIA is the most trusted gemological authority in the industry. There is no one better than GIA for Stuller to rely on to deliver on our commitment to correctly represent the product we are selling.”

Stuller Has Just Screened Its 1,000,000th Diamond!

GIA Melee Analysis Service Blog Header

Earlier this year, Stuller opened its doors to an on-site, independently-operated GIA Melee Analysis Service. Since April, GIA has screened round, D-to-Z color melee from 0.9mm to 4.0mm parcels coming through the building— scanning 1,800 to 2,000 stones per hour! Well, guess what?


We’ve Just Screened our MILLIONTH Diamond!

That’s right, more than 1,000,000 diamonds have passed through the GIA Melee Analysis Service at Stuller’s global headquarters in Lafayette, LA.

GIA Melee Analysis Service Diamonds

Why does this matter?

We brought the GIA Melee Analysis Service to Stuller headquarters to make certain that every diamond we sell is correctly represented. By partnering with GIA, we’re ensuring the most precise screening processes in the industry. After all, with over 60 years of synthetic diamond research, GIA is the foremost authority on diamond screening and authenticity.

Our industry-leading efforts promise to leave no stone unturned. With lab-grown diamonds moving into the marketplace, it’s more important now than ever to preserve the integrity of our inventory. With help from the GIA Melee Analysis Service, we confidently stand behind every stone we sell. And in turn, you can pass that confidence and trust on to your customers.

What can you do?

Begin by fully understanding the differences between natural and lab-grown diamonds. First off, lab-grown diamonds are not simulants— they have the same chemical composition and crystal structure as naturally mined diamonds. Secondly, there are two processes used to create lab-grown diamonds, High-Pressure High-Temperature (HPHT) method, and Chemical Vapor Deposition (CVD) method.

As a jewelry professional, it is important to make sure that you are able to give your customers peace of mind. In order to do that, it’s important that you equip yourself with the right tools. To get started, here are a few suggested questions to ask yourself to help you decide the instrument that is best for you:

1. Will you be screening loose diamonds, mounted jewelry, or both?

2. What size diamonds will you be screening?

3. Are you screening center stones or melee? What shapes will you be screening?

4. Do you want the instrument to be manual or automated?

GIA Melee Analysis Service Diamond Testers

Remember, no single instrument can do it all

Once you’ve answered these questions, it’s time to start your research. Here’s a link to Stuller’s website that features different types of screening equipment for both diamonds and gemstones. Remember, no one instrument screens for everything, which is why it’s very important to read the details for each piece of equipment before purchasing. And if you think these instruments are expensive, consider the cost of unintentionally selling a lab-grown diamond as a natural diamond and ask yourself this question: What is my reputation worth?

Shop Diamond Screeners on Stuller.com

Here is a handy comparison of natural vs. lab-grown diamonds—