How many gemstones are there?

Answer

There are so many different stones and minerals that are considered precious and semi-precious stones, that it would be almost impossible to name them all. Some well known gemstones are diamonds, ruby, sapphires, and emeralds.
1 Additional Answer
There are around fifty different gemstones that can be purchased for jewelry and decorative items. They are classified by the type of crystals and their optical characteristics.
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