Acropora ID please

[Reefer08]

Could you guys please ID this coral jewelry? I wanted to know if this is natural coral colors or do you think its been dyed? The seller swears that its not dyed at all and its natural from the meditterean ocean. Thanks for the help.

 

[landlord]

From wikipedia:

The coral of jewelry, unlike the organic conchiolin varities, does not form in reefs but as small branch-like structures. It is the skeletal remains of a marine animal, the polyp corallicum, and is mainly composed of calcium carbonate. The most valuable type of coral is the noble red, corallicum rubrum