Precious stones, must possess the following characteristics: “Beauty”, that is, crystal bright, dazzling. Gem if you... Read more

The reason why the most expensive diamonds, precious stones so precious, one of the reasons is that it is the world’s most... Read more

Suddenly, the world is extremely rare emerald gem, fine quality and are per carat worth tens of thousands of dollars, and some q... Read more

The chemical properties of diamonds is very stable, not easily soluble in acid and alkali. However, in a pure oxygen, the heated... Read more