When describing them, you could call them precious gems or gemstones.
Most industrial diamonds and other gems are called synthetic
These jewels are also called precious gems.
Artificial?
A scientist who studies gems such as rubies and diamonds is called a gemologist. They are experts in identifying and evaluating the quality and characteristics of gemstones.
the gems he found out about are rubies and diamonds
They are valuable because they are rare and take a long time to process to create a good looking stone. They are classified as "gemstones".
No, it is not bad luck to have other gems (or just a wedding band) instead of diamonds. It depends on the individuals taste and some women prefer other gems to diamonds. It is not always true 'that diamonds are a girl's best friend.'
Diamonds, emeralds, saphires, peridot, and topaz are some crystal gems.
Diamonds were not invented; beautiful diamonds are natural gems. But from many years artificial diamonds are produced for industrial goals.
diamonds, rubies,emeralds,and sapphire :)
You can hand-mine diamonds in Arkansas.
They can be cut. If diamonds can, all gems can.