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How to identify lab-grown synthetic diamonds from natural diamonds

June 21, 2022

Fluorescence and phosphorescence of diamonds can be observed. Lab-grown diamonds, these synthetic diamonds can be reliably identified by specialized identification techniques such as visible light and fluorescence spectroscopy.

1. Laboratory synthetic diamonds have the same properties as natural diamonds, such as optical properties, hardness, refractive index, etc. It is difficult for ordinary people to distinguish the two, and even experienced diamond appraisers may sometimes make errors in judgment with the help of professional instruments, which is why the diamond industry wants to create an instrument that can tell the difference between the two and prevent synthetic diamonds from proliferating in the market. Any boast that you can tell the difference between the two without the use of instruments is a lie!

2. To distinguish between natural and synthetic diamonds, you first need to understand how diamonds are classified: according to the presence or absence of nitrogen atoms, diamonds can be divided into Type I and Type II diamonds, Type I diamonds contain impurities nitrogen atoms, while Type II diamonds are not.

3. The difference between natural and synthetic diamond growth processes

Natural diamonds grow under a range of temperature and pressure conditions. The temperatures are higher than those used to grow synthetic diamonds.


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Synthetic diamonds have a very short growth period, from a few weeks to a month or even longer, and grow under different conditions than those used to form natural diamonds deep in the earth. Due to the very short growth period, the shape of synthetic diamond crystals is very different from that of natural diamonds.