Diamonds, Sapphire, Emerald, Ruby
All precious stones come from rocks, but pearls are formed by oysters. Synthetic gemstones are made in factories.
Jewelers work with precious metals and stones.
Precious stones are called gems.
A jeweler works with precious metals and stones.
Her ring has several semiprecious and precious stones. Semiprecious stones are not as valuable as precious stones.
Two main types; precious stones and non precious stones.
typesof precious gem
As with all precious and semi-precious stones the value depends on a number of things such as size and quality
a diamondologist which is a subset of gemologists (study all precious and semi-precious stones)
The Unit To Measure Gems And Precious Stones Is Carat.
If you think to precious stones they are compounds.
The French term for semi-precious stones is "pierres fines."