Ruby [1] refers to red corundum, which is a kind of corundum and its main component is alumina (Al2O3). Red comes from chromium (Cr), mainly Cr2O3, and its content is generally 0. 1~3%, and the highest is 4%. Sapphire is the blue of iron and titanium, and corundum with other colors other than chrome is also called sapphire.

Most natural rubies come from Asia (Myanmar, Thailand, Sri Lanka, Pakistan, China, Xinjiang, China, Yunnan, etc.). ), Africa (Mozambique, Tanzania), Oceania (Australia) and America (Montana and South Carolina in the United States). Ruby is now mainly produced in Mozambique.

Natural rubies are very rare, so they are precious, but it is not too difficult to synthesize rubies, so industrial rubies are all synthetic. 1999, a red and blue conjoined corundum weighing 67.5 carats was found in Changle County, Shandong Province, China. It is called "Yuanyang Gem" and is a rare miracle in the world. 20 12 Many ruby mines were found in the riverbed of Caracas River in Mo Yuxian, Hotan, Xinjiang, with the largest of 32.7 carats.

Chinese name

ruby

Foreign name

Ruby English

colour

Red to pink.

relative density

3.99-4.00

crystal habit

It belongs to cubic crystal system and complex cubic crystal.