Lab-created diamonds continue price decline

Two diamonds grown by Washington Diamonds. Credit: Washington Diamonds (Wikimedia).Two diamonds grown by Washington Diamonds. Credit: Washington Diamonds (Wikimedia).

The discount of gem-quality lab-created diamonds, manufactured for use in jewelry, relative to natural diamonds has doubled from around 10-20% a year ago to 30-40% today, according to a survey of prices.

For example, a white, 1-carat round diamond that is VS (very slightly included) in clarity, F-H (near-colourless to colourless) in color, VG-ideal cut, with no-to-low florescence was selling for around US$4,850 at the end of the first quarter of 2017 but is now US$4,350 — a 10% decline.

However, over the same period of time, the price of an equivalent natural diamond went from US$5,850 to US$6,150, representing an increase of about 5%. Thus, the discount of the lab-created diamond relative to the natural equivalent was roughly 17% at the end of the first quarter of 2017, but is now about 29%, a 71% year-over-year increase.

See table below for more examples.

Price comparison of lab and natural diamonds

Prices of lab-created diamonds vs. natural.
Credit: Paul Zimnisky

Lab-created diamonds are becoming less expensive relative to natural equivalents as investment in lab-diamond production technology has rapidly improved production economics in just the last few years. This has led to rapid relative supply growth and an environment that is more price competitive for lab-diamond manufacturers.

However, actually gauging lab-diamond supply growth is difficult. The global proliferation of lab-diamond production facilities in recent years, from China to Russia to the U.S., has made tracking production figures challenging, especially given that the companies involved are private and proprietary in nature. Further complicating the process is the range in quality and scale at which lab diamonds are being produced.

Natural diamond production quality can be segmented as roughly 40% gem-quality, 20% near gem-quality, and 40% industrial-grade. Gem diamonds are used in jewelry, industrial grade diamonds are used for abrasive and other industrial application, and near-gem diamonds are used for both jewelry
and more-specialized industrial application, with the split of use dependent on market prices and demand.

It is important to note that natural industrial-grade diamonds are simply seen as a byproduct, as the presence of gem-quality diamonds in a deposit are what drive the economics behind natural diamond production decisions.

In the case of lab diamonds, the ability to create higher quality gem diamond product economically is a relatively recent development — within the last decade. Even with the recent developments in technology, current lab-created production of true gem diamonds represents less than 10% of global output, estimated at less than 5 million carats. That compares to natural gem-quality output of around 60 million carats (based on 40% of an estimated total natural production of 149 million carats in 2018).

The business of manufacturing lab-created diamonds for industrial application (typically referred to as synthetic diamond) has been around for decades, and the industry currently supplies more than 99% of global industrial diamond supply for use as abrasives (production is in the billions of carats, for context).

Lab production of near gem-quality diamonds is where supply analysis gets especially challenging. Producers of synthetic industrial-quality diamonds have been advancing their production capability through improved technology which has enabled them to increase the quality of their product from industrial to near-gem quality. Given that billions of carats of industrial-quality diamonds are produced each year, it becomes apparent that lab-created near-gem production could be in the hundreds of millions of carats; and some of this product is being passed off for use in jewelry — which is primarily used to embellish larger stones and for use in pave settings.

The natural diamond industry has been proactively developing affordable screening technology so that lab-created diamonds of all quality and sizes used in jewelry can be properly disclosed and sold as such.

As lab-diamond production continues to accelerate, it seems inevitable that the price spread between lab created and natural diamonds across all sizes and qualities will continue to widen, especially in the case of generic lab diamonds, those that are not supported by a manufacturer or retailer’s brand.

Medium- to longer-term, expect the dialog surrounding lab-created diamonds to shift from jewelry to application in high-tech developments such as processing chips, optics, laser devices, and thermal conductivity equipment. The unique properties of diamond make the application potential exciting and wide, and the scientific and tech community has just begun to scratch the surface of its potential.

The high-tech industry enthusiastically awaits economically available mass-produced high-quality diamond, the lab-diamond manufacturers know this and most are just using jewelry as a stepping stone.

— Paul Zimnisky is an independent diamond industry analyst, author of the Zimnisky Global Rough Diamond Price Index and publisher of the subscription-based State of The Diamond Market monthly industry report (

This article originally appeared in the June 2018 issue of Diamonds in Canada magazine, and was published prior to De Beers unveiling its Lightbox synthetic diamond initiative in early June.


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