Gemstone

A gemstone is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments. Certain rocks and occasionally organic materials that are not minerals may also be used for jewelry and are therefore often considered to be gemstones as well. Most gemstones are hard, but some softer minerals such as brazilianite may be used in jewelry because of their color, luster, or other physical properties that have aesthetic value.

However, generally speaking, soft minerals are not typically used as gemstones by virtue of their brittleness and lack of durability.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

KNIGHTSTREASURE

Treasures of the past — medieval history and knights, castles and archaeology, hoards and antiquities, and the relics that outlast empires.

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