available between Description
Gemstones & Crystals are pieces of minerals that divide into precious and semi-precious stones. Broadly speaking diamond, ruby, sapphire and emerald are considered precious while all others are semi-precious.
Gemologists identify stones by their chemical composition, their crystal structure and their habit which refers to the location where the stone is usually found. Gemstones are also classified into groups, types & varieties. Further classifications include light properties, hardness, fracture, colour & lustre.
