Fossil Dinosaur Bone Cabochon - 40 carats

This is a beautiful showpiece of gembone with strong gray-blue cell coloring and bold black cell walls. Polished all the way to the edge with a rounded girdle, the back is unpolished with a small bevel for ease of setting.

It doesn't get much cooler than this! Gembone really is fossilized dinosaur bone! Found mostly in the flood plains and rivers of Utah and Colorado, gembone is made of fossilized dinosaur bone that has slowly been replaced with silica (SiO₂).

This creates a hard material that preserves the patterns and structures of the original dinosaur bone while also including amazing colors due to the inclusion of impurities in the silica as it is deposited. This highly polished piece of history is sure to make a beautiful piece of jewelry!

Care & Setting

Agatized dinosaur bone is a relatively resistant material, it will do well set in any sort of jewelry.

See our care and cleaning instructions for more details on how to maintain the appearance of your purchase or the FAQs for more info!

Geologic Information

Found mostly in the flood plains and rivers of Utah and Colorado, gembone is made of fossilized dinosaur bone that has slowly been replaced with silica (SiO₂). This creates a hard material the preserves the patterns and structures of the original dinosaur bone while also including amazing colors due to the inclusion of impurities in the silica as it is deposited.

Dimensions & Specifications

Size: 38.5 mm x 29.4 mm
Girdle: Approximately 4 mm
Weight: 40.30 carats
Cut: Freeform Cabochon
Material: Agatized dinosaur bone (aka Gembone)
Back: Unpolished