Smoke crystal is one of many kinds of crystals, and its colors are smoke gray, smoke yellow, yellow brown and brown. Because the color is like black smoke, people call it "smoke crystal". Some smoke crystals may turn yellow and are called "tea crystals". If they are dark, they are called "ink crystals". In recent years, with the constant influence of people's curiosity, people are scrambling to collect smoke crystals, and their market prices are also rising, gradually emerging in the gem market.

Yuanshi county Jewelry and Jade Research Institute introduced: In ancient times, smoke crystal was considered as a guardian stone to ward off evil spirits and make the race endless. It is said that the emperors of the ancient Roman Empire used it as a seal and handed it down from generation to generation. The Celts in Great Britain chose almost pure black smoked crystals as amulets to prevent evil spirits from being possessed.

There are many places of origin of smoke crystals. The world-famous places of origin of smoke crystals are Brazil, Uruguay, India, the United States and Mexico. Among them, cairngorm mountains in Scotland, England are rich in smoke crystals. The largest piece of smoke crystal found here weighs 23.6 kilograms and is currently treasured in a local castle in Scotland. Smoke crystals are produced in Xinjiang, Inner Mongolia, Jiangsu, Hainan and other provinces in China, among which Donghai County in Jiangsu Province is the most famous.

Smoke crystals are distributed all over the world, but most of them are opaque and of low value. Smoke crystals should be of average color, cotton-free, bright and clean. Smoke crystals with high transparency are very rare and expensive.