High imitation diamond testing equipment is also difficult to distinguish

Recently, the Shenzhen Gold Jewelry and Jewelry Industry Association issued an emergency briefing to remind jewellery companies and consumers to guard against “CVD synthetic diamonds”, mainly naked diamonds, weighing mostly 0.3 carats. Experts recommend that consumers pay attention to keep the consumer credentials and corresponding quality inspection certificates when purchasing.

200 synthetic diamonds detected in February

The Shenzhen Gold and Jewelry Industry Association issued a briefing on the situation recently. In May and June 2013, the National Jewellery and Jade Quality Supervision and Inspection Center discovered a large number of CVD synthetic diamonds in diamond products submitted by merchants in a number of regions. According to statistics, among the multiple inspection batches, nearly 200 synthetic diamonds were discovered, mainly in loose diamonds, and the weight was mostly concentrated in about 0.30 carats. The clarity was mostly “VS-S1” and the colors were mostly “G-1”. , The quality of goods is very suitable for the needs of the Chinese consumer market. The inspection company did not declare that the products submitted for inspection contained such commodities. Therefore, it can be inferred that there are batches of such products entering the Chinese market in the near future. The report said that most of the CVD synthetic diamonds appeared in Shenzhen, mainly for bare diamonds, and the weight was mostly about 0.3 carats.

Synthetic diamonds approaching 0.3 carat

“Synthetic drills of this kind have a weight level that is aimed at mass consumers.” Some heads of jewelry stores in Shenzhen say that 0.3-carat diamonds are more “geo”, and the mainstream diamonds on the market weigh 0.2 to 0.3 carats. An internal survey of the jewelry industry also showed that 0.3-0.5 carats of diamonds are sold to consumers, while sales above 0.6 carats are relatively small.

"In fact, as early as last year, Shenzhen has been detected in synthetic diamonds, about dozens of cases before and after the discovery, but the number of detected this year is relatively large." According to the National Jewelery Quality Supervision and Inspection Center in Shenzhen laboratory responsible person, test center height Pay attention to and warn in the industry that if it is detected twice in a row, it will be warned, the third detection will be detained, and the company will be included in the industry enterprise blacklist.

The price is less than 50% of the natural drill

The relevant person in charge of the National Jewellery Quality Supervision and Inspection Center stated that CVD high imitation synthetic diamonds are synthetic diamonds produced abroad with high technology, and their materials are also based on carbon elements like natural diamonds. Its hardness, density, thermal conductivity, brightness, flash, fire, almost no difference with natural diamonds. However, after three or five years, this CVD diamond will have its brightness, fire, and flash falling year after year until it turns yellow-brown.

According to industry insiders, CVD synthetic diamonds use traditional methods of identification, experience, hand touch, and naked eye viewing, and even experienced players are hard to identify authenticity. Even with a diamond thermal conductivity meter, high-power microscopes can hardly identify authenticity. Only large laboratories equipped with sophisticated equipment can detect it. A set of equipment capable of detecting CVD synthetic diamonds requires a minimum cost of millions of dollars; a tester who has not been trained in intensive training and has accumulated many years of test experience is difficult to identify even when operating high-end instruments.

The diamonds synthesized by this new technology are not completely synthesized. The original stone in it is a natural diamond. The volume and weight of the original stone are increased by CVD synthesis technology. From abroad, it mainly enters the mainland market through procurement channels such as Hong Kong. The newly discovered synthetic diamonds did not have a waistline imprint and the supplier did not attach any product description. Mainland diamond dealers purchased as natural diamonds. In terms of price, the official revealed that a few years ago due to production technology and production costs, the price of synthetic diamonds but higher than natural diamonds, but in recent years, natural diamond products offer lower than 20% to 50 %.

Insiders told reporters that now some jewelers with batches of CVD synthetic diamond openly to the relevant testing organizations to open the certificate, but also some of their own false certificate, you can also check, true and false mixed together to sell, want to buy cheap goods Consumers are mostly fooled. The expert advises consumers to pay attention to keeping the consumer credentials and corresponding quality inspection certificates when purchasing. At the same time stressed that this synthetic diamond is difficult to distinguish the naked eye, so there are two ways to buy diamonds more secure: Buy bare diamonds have a GIA certificate to fly, in addition to buy inlaid finished products must be issued a quality inspection certificate.

CVD synthetic diamond

Jewelry enterprises that belong to high imitation products, wholesale, and sales of diamond jewelry (including loose diamonds) must adhere to the principle of good faith management, strictly indicate that synthetic diamonds, and sale of fake and shoddy goods are fraudulent in the market, and seriously infringe on the legality of operators and consumers. Rights and interests, disrupting the jewelry market order.