Welcome to the Mineral and precious stone glossary

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  All terms

J

Japanese twin

Form of contact twinning where two single Quartz crystals are joined by the their base at an angle near 90°.

Jet

Coal that can be polished and used for ornamental purposes.

Jewel

A gem, whether cut or uncut, capable of being used as an ornament.

Jeweler

Individual whose trade is to buy and sell jewels and gemstones.

Jewelry

Jewels worn as ornaments.