Jason made this bracelet from fossilized dinosaur bone. Let that sink in for a second — he's wearing something from a creature that walked the earth over 150 million years ago.
What Is Gembone?
Fossilized dinosaur bone — called gembone in the lapidary world — forms through a process called permineralization. Over millions of years, silica-rich groundwater seeps into the porous structure of dinosaur bone, gradually replacing the original organic material with chalcedony, agate, or quartz. The bone's internal cell structure stays intact, which is what gives gembone its signature look — a mosaic of tiny cells, each filled with mineral color.
The different colors and patterns come from trace minerals that entered the cells during formation. Chlorite produces greens, iron oxide gives you reds and browns, chromium adds darker tones, and manganese creates those deep purples and blacks. Every single piece is one of a kind — the pattern of cells, the mineral mix, the colors. No two beads will ever match exactly.
Most gem-quality dinosaur bone comes from the Morrison Formation in Utah and Colorado — a Late Jurassic geologic deposit dating back 150 to 200 million years. The resulting stone has a Mohs hardness of 6.5 to 7, right in line with agate, which means it polishes beautifully and holds up well in jewelry.
To put the age in perspective: if you compressed all of dinosaur history into a calendar year, dinosaurs appeared January 1 and went extinct the third week of September. Humans showed up on New Year's Eve.
Finding Gembone in Tucson
When we were bead shopping at the Tucson Gem Show years ago, we caught up with Steve, who gave us the rundown on some incredible dinosaur bone beads.
The beads he had were from Java — about 2 million years old. I was walking back to pay for something else, and Steve was just unpacking them from a paper bag. Without even knowing what they were, my hands went straight for that bag. I couldn't stop myself from touching them — so smooth, so heavy, so important. Then I asked what they were. And that was that — a couple of strands came home with us to Honolulu.
That's the thing about these beads. You feel them before you understand them. The weight, the polish, the knowledge that you're holding something millions of years old. It changes how you think about what a bead can be.
Shop Dinosaur Bone
Browse our Dinosaur Bone Collection online, or come in and hold them yourself. These beads come from limited sources, and once a strand is gone, that exact pattern of color and cells is gone forever.
(And if you want a fun rabbit hole, look up coprolite. Yes, they made beads out of fossilized dinosaur poop too. We'll leave that one for you to Google.)