1. Black diamond: Also known as black diamond, it is a natural polycrystalline diamond found in alluvial deposits in Central Africa and Brazil. Usually black, dark brown and dark gray, it has excellent hardness and toughness, and the hardness and toughness are the highest. Diamonds with more pores than other diamonds have become one of the most popular decorations in the upper class. Among all kinds of diamonds, black diamonds are especially precious because of their scarcity.
2. Obsidian: It is a common black gem and volcanic crystal, also known as "Dragon Crystal" and "Ten Victory Stone". It is a naturally occurring silica, usually black. Also known as volcanic glass, it is an impure crystal gem. Its composition is mainly silicon dioxide, and the glass is shiny and annular.
3. Black Pearl: It is a kind of bronze pearl, which belongs to a very valuable jewelry variety. Symbolizing the crystallization of the most difficult years, it is called the most painful tear of the mother shell, which is precious after suffering. What impressed me the most was the black pearl in Tahiti. Black pearls are mainly produced in the black butterfly shell of Tahiti. This kind of mother-of-pearl can secrete black pearls, which makes the black pearls in this area present the most beautiful and unique colors.
That's all about the types of black gems.