Refining of precious metals is a special purification procedure. Precious metals can be subjected to it in the following form:
History of origin Carnelian is a mineral that was used by ancient people. Find primitive tools
Category Oxides (minerals) Name in English. Quartz Formula SiO2 Group Group of glass-forming oxides Color White,
Features of the hallmark Absolutely all jewelry has a hallmark. It determines the weight content of the precious
So, the price of 1 kilogram of gold is approximately 1,850,000 Russian rubles In dollar terms
The world is ruled by numbers - Pythagoras said this. Time has proven him right: the modern era
History and origin Despite its terrestrial origin, aquamarine is considered a stone of the sea. That's because
Good afternoon dear friends! Our article today is dedicated to aventurine - the ruler of the souls of fashionistas and
Methods for measuring hardness The degree of strength of a material is assessed by pressing a stronger object into it,
There are many mysteries associated with this stone. It is considered semi-precious, but costs like a diamond, and
