This is a solid piece of "gem bone" dinosaur bone that was recovered from private property in Moffat County, Colorado. This piece comes from a Jurassic period deposit in the Morrison Formation. It is likely from a sauropod type of dinosaur because their fossils are plentiful in this area. This type of material is sought after by lapidary artists because it is very robust and takes a high polish. Colors can be very striking when when a polish is applied to give it that wet look.
Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing the fragment shown. It is uncut and weighs 14.5 grams. Your purchase will include an ID label.