That's silicon carbide (SiC), also known as Mo Sanshi, which is euphemistically called "Mo Sanshi", but it's not a diamond at all. It's not a substance like diamond, but a diamond like zircon. There are many differences between its physical properties and diamonds, which are not easy for non-professionals to see, and its value is far from that of diamonds. My suggestion is that if you wear it for fun, it doesn't matter whether you buy it or not, and it's not worth a lot of money. If you want to buy wedding rings or something, don't confuse diamonds with them. To put it bluntly, it is a fake diamond, which is used to imitate diamonds. You must have a diamond certificate to buy diamonds, and it is best to buy one with the most authoritative international certificate GIA certificate. All diamonds with this certificate are engraved with laser numbers. If you can see them under the microscope, you can also look them up on GIA official website, so you can't go wrong. It is wise for you to buy diamonds in the wedding building. Some are wholesale diamonds, and some are quite cheap. Finally, if you really buy a diamond ring, don't buy that kind of mosan stone.