Abalone Shell 5-10 Chip Bead - 15-16 Inch Gem House USA Ancient Cellar Black Agate is

Ancient Cellar Black Agate is a natural agate that is dyed and heated to give it the unique color and pattern we call Ancient Cellar

red and brown

On cut or polished stones

This prompted an alternative name for the gemstone: Princess Blue

with darker shades being higher in value

Abalone Shell 5-10 Chip Bead - 15-16 Inch Gem House USA Ancient Cellar Black Agate isAbalone Shell is strong and is made of stacked calcium carbonate tiles. When the abalone shell is struck, the tiles slide instead of shattering absorbing the energy of the blow. The inner layer of the shell is composed of nacre (mother of pearl), which in many species is highly iridescent, which make the shells attractive as decorative objects, jewelry, and as a source of colorful mother of pearl.