Which gems are black?

Examples of black gemstones are as follows:

1, black diamond: burning red

Black diamond, also known as black diamond, is a kind of natural polycrystalline diamond, which is 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. Black Pearl: 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.

3. Obsidian: Obsidian

It is a common black gem and volcanic crystal, also known as "Dragon Crystal" and "Ten Victory Stones". This is a natural 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.

4, black agate: black agate

Agate, which is very common in nature, is also a colloidal mineral. Mineralogically, it belongs to chalcedony. Also known as longevity stone, one of the seven treasures of Buddhism, it has light specific gravity and high hardness, and can scratch glass, conchoidal fracture, natural black agate and natural texture.

5. Black tourmaline: Black tourmaline

Dark to pure black, opaque tourmaline. It is usually a variety rich in iron or titanium and the most common tourmaline. Under the action of gasification agent, it often occurs in the contact zone of granite and crystalline schist, gneiss and phyllite.

Tourmaline, also known as tourmaline, has piezoelectricity and pyroelectricity. Tourmaline is cleavage-free, dark to pure black, metallic and opaque. The current generated by rubbing black tourmaline can adsorb tiny pieces of paper.