Gems

History and origin Science has established that the properties of amethyst were studied by the Sumerians. In Egypt, stone

History and origin There are two versions about the origin of black diamond: terrestrial and cosmic. Counts,

Silver nugget Silver - Ag, a mineral of the class of native elements, crystallizes in the cubic system, cubic-hexoctahedral

Spinel is an original and very rare metal. The gemstone has a rich color and memorable

Property Description Formula Ca2Al3(SiO4)(Si2O7)O(OH) Hardness 6.5 - 7 Density 3.35 g/cm³ Refractive index 1.691

When it comes to the weight of precious stones and metals, a term that is unfamiliar to the average person appears:

The hardest stone in the world is one of the modifications of carbon diamond, the formula of which is denoted

Labradorite is a precious natural mineral with mystical properties and incredible external beauty. Labradorite stone

Silver is one of the rare elements that form the group of precious or noble metals. TO