Ruby refers to red corundum, which is a kind of corundum, and its main component is alumina (Al? o？ )。 Red comes from chromium (Cr), mainly Cr2O3, and its content is generally 0. 1~3%, and the highest is 4%. The blue color containing titanium is called sapphire (quoted from Fundamentals of Mineralogy).

Most natural rubies come from Asia (Myanmar, Thailand, Sri Lanka, China, Xinjiang, Yunnan, China, etc.). ), Africa, Oceania (Australia) and America (Montana and South Carolina in the United States).

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, and it was called "Yuanyang Gem".

Extended data

Ruby main origin:

1, Myanmar

Burmese ruby has two main producing areas, one is Burmese ancient animal husbandry; The other is Su Meng, Myanmar. Myanmar ancient animal husbandry is the most exquisite ruby producing area in the world, which is famous for its pigeon blood red.

2. Thailand

Thailand is also an important producer and trading center of rubies. It is reported that nearly 70% of the world's high-quality rubies are produced in Thailand. Ruby is produced in Chantawuli, southeast Thailand.

3. Sri Lanka

Sri Lankan ruby is famous for its high transparency and soft color. Moreover, the particles are large and the color changes greatly, from light red to red, pink, brownish red or brownish red to cherry red. High-end products are bright red with pink and yellow tones, often called cherry red or water red.

Baidu Encyclopedia-Ruby