This fossil coral pendant is 2 1/4" from the top of the bale to the bottom of the stone. It is set in solid sterling silver with a "ribbon" of silver adorning the top. 
Fossil coral is a natural type of gemstone formed by ancient corals. The proper name for fossil coral is 'agatized coral' or 'agatized fossil coral', because during formation, the coral remains are gradually replaced with agate, a variety of naturally occurring chalcedony, or microcrystalline quartz.