What type of coral.

Hello everyone I have a bunch of this red coral they all have holes drilled for making jewelry is my reason for posting in the jewelry forum I’m sure they are all natural and not dyed I used Acetone on a rag and rub the heck out of them and none of the red came off on the rag so I figured they where not dyed iam just trying to narrow down what type of coral they are and from where if possible. Thanks Matt

 

Looks like a mix, the ones with the black bands look like Isis hippuris (jointed coral), if so they will be dyed as they don't come in red naturally. SOme of the bigger pieces also look like this. Some of the beads are probably red coral. Kind of difficult to say without some closer sharp images.

 

Bamboo coral... Always dyed when not white!

https://en.m.wikipedia.org/wiki/Bamboo_coral

https://www.leaf.tv/articles/how-to-clean-white-gold-rings/

 

Beat me to it. It's the dyed Chinese coral I'm always finding here. They've gotten better at the dye.

 

Thanks everyone for the responses gives me a new direction to do some research. Thanks again to all. Matt

 

Some of it looks like branch coral.