Grade A Fossilized Bali Coral 7 inch’s Adjustable Bangle. Fossilized Bali Coral refers to ancient coral from Indonesia that has turned into stone (often agate or calcite) over millions of years, creating unique, patterned cabochons and gems prized for jewelry, especially in Balinese silverwork, offering intricate designs that reveal the coral's original structure, like honeycomb patterns.