“Grown” diamonds — a term the Diamond Producers Association disputes as misleading — cost consumers 30 to 40 percent less than natural diamonds.
Not surprisingly, companies like De Beers, Rio Tinto and other members of the Diamond Producers Association have cried foul, saying lab diamonds are inauthentic. The manufacturers of synthetic diamonds, on the other hand, are promoting the environmental benefits of their process, hoping to attract millennials more concerned about being green and saving money than embracing the tag line “a diamond is forever.”
But it may turn out that the buyers of these synthetic diamonds, particularly those trying to get more diamond for less money, may lose out in the end.
Let’s start with how synthetic diamonds are made. The process can be completed in as little as three months. There are two approaches. One simulates the crushing force of the earth by applying high temperature and high pressure to dissolve carbon into a diamond seed. The other is akin to a 3-D printing approach, with pieces of carbon being layered on a diamond seed in a vacuum chamber.
The result is a diamond that has the same properties as a natural diamond but different and distinguishable crystal patterns.
Credit Sam Hodgson for The New York Times
This is not the first time gemstones have been manufactured. In the late 1800s, Auguste Verneuil, a French chemist, manufactured the first synthetic rubies. His process has also been used to make synthetic sapphires. Cultured pearls, where an irritant is placed into the oyster to create a pearl, have been made since the 19th century in Japan.
The first synthetic diamonds were created in the 1950s for industrial uses by companies like General Electric. They did not approach gem quality until the 1970s and 1980s, beginning with colored diamonds.
Tom Moses, who overseas the laboratories and research at the Gemological Institute of America, said it was not until the last five years that synthetic diamond producers began to create stones that could compete with natural diamonds — and fool people buying them.
They look the same to the naked eye, but many in the diamond trade say they are deceiving buyers.
“It’s almost a fraud on the buying public to say they’re the same thing as diamonds from an economic standpoint,” said Tom Gelb, a co-founder of the Diamond Durability Laboratory and a consultant to the diamond industry.
Mr. Gelb bets that the value of synthetic diamonds will drop as production costs fall. It is a gem’s rarity, he says, that maintains its value. If price is the issue, he suggests sticking with a proven fake, cubic zirconia: “You can get one for $25, so why would you pay $3,500 for a synthetic diamond?”
But not all jewelry designers agree with the industry’s rarity argument.
“Diamonds are a commodity with tightly controlled sourcing and marketing,” said Jeffrey D. Feero, managing partner of Alex Sepkus, a high-end jewelry designer. “I don’t consider most diamonds rare and unusual, except for rare, natural-colored diamonds in green, red, pink, purple and vivid yellows.”
That argument aside, there are two primary areas where buyers could be hurt financially. The first is in their ability to resell manufactured diamonds. One argument for buying gemstones is that they are a store of wealth.
This holds true for large, rare diamonds — or rubies or sapphires, for that matter. But small diamonds, like ones in engagement rings, are too widely available to appreciate in value and do not often maintain the price paid for them at a retail store.
“Maybe 2, 3, 4 percent of diamonds have the opportunity to appreciate over time,” said Alan Bronstein, a diamond trader who is president of the Natural Color Diamond Association, a trade group.
That’s bad enough for natural diamonds. But there is at least a willing buyer at some price. Mr. Bronstein said there was no secondary market for manufactured diamonds, largely because diamond traders will not deal in them.
Credit Sam Hodgson for The New York Times
“If people think they’re getting a bargain when they buy a synthetic diamond, the discount that they’re getting is not considerable enough when you think of the possibility that they won’t be able to recover some financial benefit if they need to sell it,” he said.
The second risk, though, is that a buyer might purchase a manufactured diamond believing that it is a natural diamond.
Mr. Feero, who said he used only gemstones that occurred in nature, said he worried about fakes because the quality of manufactured diamonds had improved so rapidly. “I have no problem with lab-created gemstones, but I have a problem with a lack of disclosure,” he said. “Disclosure will be the saving ingredient.”
The Gemological Institute of America and other groups have created tools to distinguish between the two types of diamonds.
Kelly Good, director of marketing at Pure Grown Diamonds, said the company favored disclosure. It inscribes each diamond with a laser to note it was grown in a laboratory. She said these synthetic diamonds had value, and she encouraged buyers to insure them just as they would a natural diamond.
“It’s not like you can turn on a machine and just keep pumping out diamonds,” Ms. Good said. “You need a sustainable amount of money to produce them. These labs are not cheap to run, and this product isn’t cheap, either.”
James Shigley, head of research at the Gemological Institute, said the more common risk to consumers was with tiny diamonds, known as melee, that are used as accents for jewelry. “They’re hard to test,” he said. “Thousands of them could be a couple of carats.”
There are machines to test them, but trade buyers worry that someone could mix small synthetic stones in with real diamonds and that they would go undetected.
Mark Michaels, the fifth-generation chief executive of the jewelry retailer that bears his name, said his company moved gingerly into selling synthetic diamonds in September. He was not worried about the manufactured diamonds being confused with the natural ones because his company is upfront about distinguishing the two, but he was concerned that the less-expensive option could cannibalize sales of natural diamonds.
But in the holiday season, more than half of the sales of synthetic diamonds in his stores were to people who might not have otherwise bought a diamond. Much of the rest were to people who had a set budget and opted for a larger, manufactured diamond.
That switch is what diamond producers fear now. But down the road, it could mean less — or no — value for the owner of that diamond.