Agate is usually cut or polished for use as ornaments or pendants. Most agate now comes from huge deposits in Uruguay and Brazil. Its striking color owes its uniqueness to the amount of lead found in the compound. Amethyst - Amethyst is crystalline quartz in shades of purple, lilac or mauve. Amethyst was traditionally worn to guard against drunkenness and to instill a serious mind.
Amethyst is found in alluvial deposits or in geode rocks.
Some of the largest geodes containing amethyst have been found in Brazil. Carnelian Also called Cornelian, this translucent, reddish orange variety of chalcedony was once thought to still the blood and calm the temper. The best carnelian is from India. Coral Coral is made up of the skeletal remains of marine animals called coral polyps. These tiny creatures live in colonies that form branching structures as they grow eventually forming coral reefs and atolls.