Lab-Grown Diamond Melee: Now in the Mix?

October 21, 2019 Cheryl Kremkow Jewelry Trends Tags: 13 Comments

Martin Rapaport recently wrote an editorial saying that the mixing of lab-grown and natural diamond melee will soon be the norm. I asked Karen Rosengart, the CEO and founder of K. Rosengart, a well-known diamond melee supplier in New York who sells to some of my favorite jewelry designers, if lab-grown diamonds were already an issue in the market today, particularly in parcels of the small diamonds known as melee.  Karen had a lot to say about the influx of synthetic diamond melee, who is and should be concerned by this growing trend, and what she is doing to make sure she doesn’t sell synthetics to her clients.


How big of an issue is synthetic diamond melee today? Are lab-grown diamonds being mixed into parcels?

Synthetic diamond melee is a huge issue. How can people sell something and stand behind it without being completely sure about what they are selling?

Synthetic melee is absolutely being mixed into parcels without the buyer knowing it. I have several clients bringing parcels and finished jewelry to me to be tested. We have seen synthetics mixed in.

Who should be worried about this?

Different design, manufacturing, and retail clients have voiced concerns and approached me for testing. I find that designers are extremely concerned – as they should be. Would you want to put your name on something stating one thing while unknowingly providing another?

Should consumers be just as concerned?

Absolutely. How would you feel about buying something and thinking that it’s natural only to find out you are getting something lab grown?

What is the price difference between synthetic and natural diamond melee?

Right now, there is a 30% price difference. However, I believe that difference will continue to grow. The question of price really should be a question of value. Synthetics have almost no resale value.

What are you doing to make sure you don’t sell synthetic diamond melee?

Not only do all our sight holder suppliers screen our diamonds prior to shipping, but we also check all our melee diamonds using a Yehuda Sherlock Holmes Detector. In addition, since we do not sell synthetics, there is no chance of ever having any synthetic inventory mixed in.

Is the transparent sourcing of melee something that is feasible? Is there a demand for it?

There is always the question about being completely transparent about from where our melee is sourced. As of now, we can tell you the mines from which our rough is sourced. We do hope in the future we can tell you more specifically from where each stone comes. It seems that is where the industry is headed.

Let’s hope we can continue to educate designers, retailers, and consumers that natural is the only way to go. After all, we are making memories and celebrating special occasions. Who wants to tarnish that with keepsakes that become worthless? Wouldn’t you prefer something natural from the crust of the earth, something that holds its value, rather than something grown in a lab and worth next-to nothing?


  1. Summer 2 years Reply

    Great interesting read, love the article. Keep them coming!

  2. Aisha Chauhan 2 years Reply

    Thank You for sharing this Informative Blog. As you like diamond jewelry so i would like to share you this awesome website “Diagem Diamonds” where you will get high quality diamond jewelry at the lowest prices guaranteed.

  3. Erario jewels 2 years Reply

    Every story has a beginning, our family business began back in 1967 by the name of Parmar jewellers. Our journey started with a small dream to create quality and aesthetic beauty through exquisite jewellery. Ever since then our small dream has been constantly evolving. From having a large family of loyal customers to having one of the oldest showrooms in Malad, we have come a long way. Currently, Erario is at the forefront of innovative jewellery design, expert craftsmanship, and trusted exponential service.
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  4. Jan B 3 years Reply

    Like Niall, I too prefer CZs, however lab-created stones are becoming more the rage due to price. If one is looking for a piece that has resale value, the natural stone is the way to go. If one is looking to fill their collection relatively easy, lab stones are not too bad. Just know what you are buying. This is an interesting, informative blog. Thank you for sharing!

  5. Shalini Sharma 3 years Reply

    Absolutely loved your article…keep sharing such articles with us.

  6. Divine Box 3 years Reply

    This is so wonderful article. Its so informative too. I liked how effective the writing is.

  7. Monique Newton 3 years Reply

    Good interview. I’m a gemmologist, as well as own a retail store and work with a manufacturing jeweller. So this knowledge is important on all levels for me. I personally dont favour synthetic anything, but feel that disclosure (knowing what you have) is 1000% necessary.

  8. Ophira Diamonds 3 years Reply

    I found the perfect blogging platform for us. I highly appreciate that your kind words are very informative. Our business needs blog like yours.and our diamond store in New York is eagerly waiting for the business tips from your blog.

  9. Gabriela 3 years Reply

    We’ve been wondering about this issue for years and it’s great that you are bringing it to the table with this interview. It’s just too easy to mix lab created and real melee diamonds without anyone even recognizing it. I think it’s pretty hard for suppliers to test every single 0,003 ct. stone, unless you own the Sherlock Holmes devise mentioned in the interview. Especially small businesses (local goldsmiths etc.) will struggle to do so. Anyway, thank you for this interesting blog post!

  10. Niall 3 years Reply

    I prefer cubic zirconias due to the price, We have just started an ebay shop would be great to let us know what you think!

  11. GoodGem 4 years Reply

    Hello Cheryl – interesting interview from Miss Karen. I wonder how many of today’s Millenials and Gen Z care about whether lab-grown melees are added into the mix. My guess is that some care deeply, and some don’t have an initial knee-jerk reaction.

    That being said, it’s important to be able to “stand behind your product” and know what you’re selling as a jeweler. Just my take.

  12. Clarte Diamonds 4 years Reply

    Unlike mined diamonds which were formed under Earth’s crust billions of years ago through natural pressure, lab-grown diamonds are created by man by using high pressure and high temperatures to form a diamond crystal.

    Lab-grown diamonds are real, not synthetic. Lab-grown diamonds cost 50-70 percent less than mined diamonds, while having an identical structure. The main criteria to keep in mind when shopping for diamonds are the “4 Cs” – cut, color, clarity and carat. A lab-grown diamond can be as good as the best “natural” diamond out there.
    Many people still do not trust lab-grown diamonds, and some companies choose not to disclose that their diamonds are lab-grown. We are here to change that. We aim to build confidence in lab-grown diamonds by delivering the highest quality crystals and jewelry at affordable prices.

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