A person who studies is called a gemologist, while a dealer in gemstone can be referred to as a JEWELLER
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No. Sapphire is a precious stone.
Yes, an emerald is considered a precious stone.
its not true... some semi-precious stone are more expensive than precious and even diamonds.
The word is jewel. It is defined as a precious stone.
A flat cut on a precious stone is called a "table cut". It is a cut where the top of the stone is polished flat with large facets.