jewel, gem, precious stone

a precious or semiprecious stone incorporated into a piece of jewelry

• solitaire — a gem (usually a diamond) in a setting by itself
• diamond — a transparent piece of diamond that has been cut and polished and is valued as a precious gem
• ruby — a transparent piece of ruby that has been cut and polished and is valued as a precious gem
• pearl — a smooth lustrous round structure inside the shell of a clam or oyster; much valued as a jewel
• emerald — a transparent piece of emerald that has been cut and polished and is valued as a precious gem
• sapphire — a transparent piece of sapphire that has been cut and polished and is valued as a precious gem

• jewelry, jewellery — an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)