A troy ounce (denoted on the exchange as t oz or ozt) is equal to 31.1034768 grams and
Refining is the purification of metal from impurities. This process consists of a series of sequential separation processes
September 16, 2021 Fans of precious metals at least once in their lives were seriously interested in what
Flint is a natural mineral based on chalcedony. It does not belong to precious stones and
Heliotrope is a stone with a unique appearance. Due to the fact that its entire surface is covered
Category Minerals Name in English. Cacholong Formula SiO2•nH2O Group Opal Group Color White, Blue
History and origin There are two versions about the origin of black diamond: terrestrial and cosmic. Counts,
Today, the jewelry industry has reached such a level that fashionable and beautiful products are made
Sodalite is a semi-precious mineral of the feldspathoid class, rarely found in nature. The history of its origin today
Category Plutonic rocks Name in English. Labradorite Formula SiO2 45-52% Group Group
