This is an ancient great white tooth fossil with some unusual colors and markings on the blade

Behold, this fossil great white tooth, discovered by Jason at Dark Water Megs, is presented in its natural state, free from any repairs or restorations, in line with all the teeth available at DarkWaterMegs.com. Each tooth is genuinely unique, and this fossil great white tooth is certainly no different. Consider it for a remarkable gift or as a prized addition to your collection.

This products and others you see being offered by Dark Water Megs are fossils, they are not modern bone, they are not modern animal products.
Dark Water Megs does not and has never sold animal products, these are fossils.
"Fossil: impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock"

The ancestor of the modern day great white shark, the Carcharodon Carcharias or prehistoric great white shark is believed to have reached up to 30 feet long and would have been a fierce predator in the ancient oceans, possibly competing for food with the megalodon shark.

The ancient great white would have lived during the era of the megalodon shark around the Miocene to Pliocene era which means this fossil is between 3 and 16 million years old. It is thought that the ancient great white would have competed with smaller and mid size megalodons for food as well as eaten some of the same whales and ancient manatees.

The video below shows shark teeth being found in a dark water river. The tooth above is not in this video but this gives you an idea of how I find these teeth.