Natural Fossil Coral Gemstone
Corals are among the most colorful animals in the sea. The proper name for this material is agatized coral or agatized fossil coral. The fossilized coral typically appears as small flower-like patterns in the stone.
Agatized fossil coral can exhibit a wide range of natural colors, ranging from white and pink to brown, gray, black, yellow and red. Corals may vary widely within a single stone depending on weathering and oxidation and the original mineral content.