Precious and semi-precious stones

Precious and semi-precious stones.

We have already mentioned many names of gemstones, So it's time to think, how many of them exist at all and can they be systematized in some way.

Specialists have already counted over 300 stones, przy

Classification of gemstones

Classification of gemstones.

Bauer reported, adopted for K.. E. Klugiem the division of stones, precious on 5 class. The basis of this division is primarily the hardness of the stones, having a major impact on their price. The right gemstones (jewelery), wyróżniające