中文/英文

What is lab grown diamond? What is CVD diamond?

2018-11-01

A kind of diamond is popular in European and American markets. It is similar to natural diamond, but the price is much more favorable. Merchant call it lab grown diamond. Many consumers will have doubts about what is lab grown diamonds, whether they are real diamonds and whether they can be bought? So, this article will introduce you to lab grown diamonds.

What is lab grown diamond?

Lab grown diamond is a kind of diamond cultivated by scientists in the laboratory with high-end technology. At present, there are two lab grown methods: chemical vapor deposition (CVD) and high temperature and high pressure (HPHT). Lab grown diamonds have the same physical properties, chemical composition and crystal structure as natural diamonds.


Is lab grown diamond real?

Lab grown diamonds are genuine diamonds, which are essentially different from imitation diamonds such as moissanite, zircon and so on. Its structure is the same as the natural diamond, except that it is made in the laboratory. In short, lab grown diamond is like ice in a refrigerator and ice in nature. It is worth mentioned that diamonds can be divided into Ia, Ib, IIa and IIb according to contained microelements and content. 98% of natural diamonds belong to Ia type, only 2% of high-quality natural diamonds belong to IIa type. Colorless CVD lab grown diamonds belong to high-quality IIa type, with less impurities and better light transmission!

CVD diamonds and HPHT diamonds are lab grown diamonds. What is the difference?

Compared with HPHT process, CVD diamond process has several advantages:

1. The lab grown diamond produced by CVD are larger.

2. CVD process can better control the environment of growth chamber, so as to better control the properties of finished diamond.

3. It is difficult to produce truly colorless diamond by HPHT process. In the process, even the smallest amount of nitrogen or boron in the process causes the diamond to appear yellow or blue.

In the worldwide, only Zhengshi Technology can produce the best quality CVD diamonds without any treatment. In 2019, these CVD diamonds were certified by the IGI as the only pure CVD diamond in the world.

HPHT Diamond

CVD Diamond

Identification standard of lab grown diamond

Like natural diamonds, lab grown diamonds are graded and priced using the 4C standard. The type of impurities and the color depth of each lab grown diamond may be slightly different

At present, many authorities are introducing a new "5Cs + 2T" standard to evaluate CVD diamonds. 2T represents transparency and treatability. Zhengshi Technology's CVD diamonds are of exceptional transparency and no post treatment.

Certificate of lab grown diamond

At present, most of the lab grown diamonds are certified by IGI. Each lab grown diamond has a unique code engraved on the waist of the diamond.


Do lab grown diamonds keep value?

To answer this question, first of all, we have to think about, do diamonds keep value? At present, more than 5 carats of high-quality natural diamonds can be said to keep value. Rare and beautiful, some people are willing to accept the offer, so as to keep the value. Why don't you buy a second-hand diamond instead of a new one? Therefore, if you buy them to look good, in terms of value preservation, lab grown diamonds and natural diamonds are actually the same.

Is it worth buying lab grown diamonds?

The biggest advantage of lab grown diamonds over natural diamonds is the price. For two diamonds with the same parameters, the price of lab grown diamonds is one fifth of that of natural diamonds, but there is no difference between them except birth. Therefore, considering the cost performance, lab grown diamond is the first choice. Of course, if the receiver is very resistant to the lab grown diamonds, that's another matter.


Above is some basic introduction about the lab grown diamonds and CVD diamond, you want to learn more about lab grown diamond knowledge, or want to buy a CVD lab grown diamond directly, welcome to inquire or leave a message on the website.