The dinosaur bone we use in our dinosaur bone pendants and rings is usually referred to as “gem bone”. It is actually not bone but is a combination of minerals that have replaced the bone over time. Dinosaur bone is found in a rainbow of colors with the webbing color and cell size varying greatly from piece to piece. The varying cell size and colors create some truly unique patterns that make dinosaur bone jewelry stand out from everything else. The fossilized dinosaur bones can be composed of many different minerals including agate, jasper and calcite. The dinosaur bone color is determined by the combination of minerals present when the fossilized bone was formed. Some colors are more rare than others, with multicolor cells in a nice pattern being the most sought after. High quality dinosaur bone has a hardness of 6-7 on the Moh’s scale making it suitable for jewelry use. Most of the agatized dinosaur bone used in our jewelry comes from the Colorado Plateau in Utah and was a living animal during the Jurassic Period, around 144 to 208 million years ago.