Part 3 of 3
By Hemdeep Patel
The most common myth regarding synthetic diamonds is a CZ tester can be used in their identification. A synthetic and its natural counterpart have the same chemical structure; they also have the same physical properties, meaning they react the same way to a CZ tester. Therefore, this method cannot be used as a way to separate natural diamonds from lab-created.

Gemesis jewellery featuring both colourless and yellow lab-created diamonds. Photo courtesy Gemesis.
As in the case of synthetic corundum and emeralds, the key to identifying labcreated diamonds is to look for key characteristics left behind during the growing process. Many of these features can be identified at the macroscopic and microscopic levels. But in some instances the results are ambiguous, requiring more advanced analysis at the atomic level by way of spectroscopy.
Through macro and microscopic analysis, HPHT synthetic diamonds can be identified by a number of key features. In some cases, tiny fragments of metal— residue from the metal chamber in which the stones are grown—can be found, magnetizing the stone. Intersecting internal graining lines is another indicator of a diamond’s lab origin. The absorption of nitrogen and boron at different rates and intensity result in colour zoning areas that can be seen under ultraviolet (UV) light as a green cross pattern on an inert background. As well, most HPHT-created diamonds exhibiting fluorescence under UV light continue to glow a short time after the source is removed. This effect is called phosphorescence. Conversely, CVD diamonds do not leave behind any distinct macro and microscopic features. Therefore, a detailed spectral analysis must be conducted when a stone is identified as Type IIa invisible to UV light.
What’s in a name?
I have spoken to many industry members regarding synthetic diamonds and reactions vary. Many feel natural diamonds have a unique place in a person’s life, since they are usually offered as a symbol of love and as such, there is an overwhelming preference for a natural stone as opposed to man-made. There are many who feel lab-created diamonds are a trend that will quickly go away, or may not be a threat at all, as it was with synthetic gemstones. Although both may be correct and valid assumptions, I would like to add a few other pieces to this puzzle.
While gem-quality synthetic diamonds have been available since 2000, they haven’t taken a strong foothold, with many pointing to marketing as the culprit. First, what do you call them? In 2008, synthetics manufacturers felt ‘cultured diamond’ accurately described their product. On the other side of the fence were the Jewellers Vigilance Committee (JVC), World Federation of Diamond Bourses (WFDB), and CIBJO, who felt the term ‘cultured’ could be misrepresented and does not accurately describe the stone’s true lab-created nature. Instead, they preferred ‘synthetic diamond.’ The fight made its way to the U.S. Federal Trade Commission (FTC), which upheld the term ‘cultured diamond.’
The second part of the marketing dilemma was how to introduce lab-created diamonds to consumers accompanied by an information package from a recognized body. This problem was solved in 2006, when the Gemological Institute of America (GIA) announced it would be issuing full grading reports for lab-created diamonds. I feel this was a watershed moment for the cultured diamond industry, as did Lux when I asked him. Though GIA reports are colour-coded to indicate a stone’s lab-created nature, it is the information of its clarity, colour, and cut that may prove very useful to manufacturers like Gemesis. It is now possible to compare lab-created diamonds to their natural counterparts as equals, a fact most in the industry do not welcome.
Strategizing
Major manufacturers of cultured diamonds have taken positive steps to assure the jewellery industry their intention is not to harm the marketplace, but rather to introduce a new product line with untapped potential. Their marketing strategy hinges on four key facts.
First, cultured diamonds are chemically the same to their natural counterparts and cannot be distinguished without the use of advanced gemmological equipment. Setting aside issues surrounding identification, only the buyer knows the diamond they’ve purchased is synthetic.
Second, some would argue the manufacturing processes needed to create cultured diamonds are more environmentally friendly than extracting natural stones through vast mining operations. Third, the conflict diamond issue is a non-starter when it comes to cultured diamonds. The same cannot be said in regard to natural diamonds, particularly in light of the ongoing debate on whether rough from Zimbabwe’s Marange region should be certified by the Kimberley Process (KP) and exported. And lastly, cultured diamonds of similar colour and clarity to naturals are about 20 per cent less expensive. Lux seemed quite steadfast in our discussion that Gemesis’ pricing policy will be firm on maintaining value by not undervaluing its product, much like what happened in the synthetic gemstone market.
A matter of trust
The issue of transparency is one that is always tossed around when it comes to lab-grown diamonds. Manufacturers—including Gemesis—assure stones of any significant size will be laser-inscribed. In addition, they will be examined and graded by a reputable and recognized gemmological laboratory.
Disclosure is one of the main drawbacks of cultured diamonds. Though major manufacturers continue to maintain a transparent business model, there are numerous entities throughout the world that don’t hold the same philosophy. Instead, those businesses aim to bring to market white and coloured cultured diamonds without any disclosure. As well, lab-created small diamonds ranging from one to 20 points will inevitably become a significant concern.
Since there is no intention of laser inscribing melee, what assurances does anyone have that disclosure will be maintained through the supply chain. Consider also the secondary markets created by the ‘cash-for-gold’ business model. It is possible consumers who sell their diamond jewellery to the trade may or may not disclose the nature of the stones or even know whether they are lab-created or not.
It’s true some of these concerns may not seem pressing at the moment, however once a significant number of synthetics make their way into the marketplace, these issues may become something the industry must address and decide on how to proceed.
Where do we go from here?
So where does this leave the jewellery market today? I would say we are in an unenviable position. We have a fairly good idea of what the issues are, but the missing element in this equation is the consumer’s reaction to this new product. During the economic downturn, most manufacturers hit some hard times and many had to reevaluate their business model on how to bring their goods to market. In the case of Gemesis, this involved moving from a business-to-business model to one of a direct-to-consumer. Ten years ago, it was said jewellery could never be successfully sold on the Internet. But here we are in 2011 and we find that today’s consumers are quite comfortable making online purchases of pretty much anything, including jewellery. With a strong push through social media and online advertising, Gemesis aims to reach a new audience who find it convenient to purchase online and are looking for an alternative to natural diamonds that may address their concerns regarding the environment, price, and conflict-free status.
To be prepared, jewellery retailers must re-educate themselves on the definition of lab-created diamonds, their properties, and concerns surrounding disclosure. Regardless of the topic of discussion, the issues facing the jewellery industry can be overwhelming, but they are not insurmountable.