Dinosaur Bone Fossil Ring

Gembone is agatized dinosaur bone. This occurs when ancient bone cells are filled and replaced by minerals like quartz, agate, hematite, or manganese. The speckled pattern reflects the original spongy, honeycomb-like structure of the dinosaur's marrow. 

These specific gray and speckled colors in this gembone are created by gray clays, limestone, and iron in Utah.