Synthetics, origin

The Spark of Confidence

What are Synthetic Diamonds?

Synthetic diamonds are sometimes referred to as laboratory-created diamonds, laboratory-grown diamonds, or cultured diamonds, and are manufactured diamond crystals produced by man, not nature.

Synthetic diamond can be optically and chemically identical to natural diamond.
Gem-quality synthetic diamonds are predominantly cubic and octahedral in the rough form. Impurities are common, but as the technology has progressed so the rough diamond crystals have improved. A diamond's hardness can vary depending on its impurities and crystalline structure.

Although synthetic diamonds have similar structure and chemical properties to a natural diamond, they can be conclusively identified by differences in atomic structure and trace impurities due to their different growth environment.

Colour zoning, inclusions, fluorescence and other properties of synthetic diamonds provide practical visual indicators using standard gemmological techniques and equipment, but conclusive identification requires advanced equipment and trained technicians in a laboratory.

Synthetic diamonds can sell at a fraction of the cost of natural diamonds, because they are made for less than it costs to mine a natural diamond. For this reason they are a viable alternative to natural diamond or less durable simulants.

DCLA does not certify synthetic diamonds, but laboratories that do opt to certify synthetic diamonds must clearly state on the certificate that the diamond is a laboratory-created, synthetic diamond.

There are currently two known processes for growing synthetic gem-quality diamonds: the High Pressure High Temperature (HPHT) method, and the Chemical Vapour Deposition (CVD) method.
 

HPHT Method for Growing Synthetic Diamonds

The High Pressure High Temperature (HPHT) method to produce synthetic diamonds uses large presses that can weigh several hundred tons and enormous heat to reproduce the conditions that created natural diamonds. Diamond growth occurs when a form of carbon, graphite, is subjected to this high heat and diamond stabilising pressures in the presence of a metal for a certain period of time. The metal acts as a solvent for the graphite, and also acts as a catalyst to enable crystal growth.

To create coloured HPHT synthetic diamonds, the as-grown diamond crystal may be treated with various methods to induce a colour change, just as natural diamonds are colour treated.

CVD Method for Growing Synthetic Diamonds

The second method, using Chemical Vapour Deposition or CVD, is very much like the process of creating frost on a window pane, when water molecules condense from the air and create a layer of frost. Diamond crystals are formed from a carbon-containing gas without the use of pressure.

The CVD method for growing synthetic diamonds was invented in the 1980s, and involves mixing gases (typically methane and hydrogen) in a vacuum chamber. When heat is applied inside the chamber, chemical reactions of the gas mixture deposit synthetic diamond onto a diamond substrate.

All DCLA certified diamonds are guaranteed to be Natural and Untreated, as stated on every DCLA diamond certificate.

latest news

Thursday 18 May, 2017

DE BEERS TAPS INTO POLISHED DIAMONDS MARKET WITH FIRST-TIME AUCTION

Anglo American’s De Beers, the world’s largest rough diamond producer by value, has decided to begin selling its own polished diamonds in auctions for the first time in its history.

Wednesday 17 May, 2017

SOTHEBY'S SELLS THE APOLLO AND ARTEMIS DIAMONDS FOR £44.9 MILLION

Wednesday 10 May, 2017

US WOBBLE TAKES SHINE OFF PANDORA SALES

Pandora reported strong growth in the first quarter, but US store closures and sluggish mall traffic dented its performance stateside.

Sunday 7 May, 2017

IMPORTANT ADVICE ON HOW TO SELL YOUR DIAMONDS

If you are you considering selling your diamond, but feel as though you have no idea how or where to begin with the process?

Thursday 4 May, 2017

GEM DIAMONDS RECOVERS 80 CARAT ROUGH DIAMOND

Another D colour Type II diamond weighing 80 carats has been recovered.

Wednesday 3 May, 2017

THIS BLUE DIAMOND IS NATURAL—AND ALSO SYNTHETIC

The good news is, from everything we know, all lab-grown diamonds are detectable, and the detection devices are getting better and (somewhat) cheaper.

Tuesday 25 April, 2017

CHRISTIE’S TO OFFER 92CT. PENDANT

A 92.15 carat diamond pendant worth up to $20 million will lead Christie’s Magnificent Jewels auction in Geneva next month.