A smaller oval shaped semi precious gemstone brown fossil Turritella Agate designer cabochon that is 31 mm long by 18 mm wide and 5 mm thick.
Turritella Agate is actually Turritella seashell that has been agatized or replaced by silica.
This semi precious fossil gemstone material comes from Wyoming. Turritella Agate is from the Miocene Epoch and is about 24 million years old. Turritella fossil cabochons are about a 7 hardness, wear well and take a good polish.
Cabochons are stones cut for jewelry and are measured in mm. One inch is equal to about 25 mm.