A gemstone is a mineral or mineral variety valued for its exceptional aesthetic properties.
To be considered a gemstone, a mineral must meet the following criteria:
Main types of gemstones:
diamond - the only gemstone with its own unified grading system
emerald
sapphire
ruby
(list of generally best-known gemstones and their most typical colors)
The price of a gemstone is primarily influenced by its quality, size (measured in metric carats), and rarity. Another factor affecting the price is the existence of artificial competing products (sapphire, ruby) and current fashion trends. The price increases with size.
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