Angelar's skin

Angelar's skin, also called angel's skin, is not a mineral but a delicate pink coral found on reefs in shallow tropical waters. Proper preparation included baking in the sun for many days to dry it out and to eliminate the odor of dead sea life. It could then be worked into jewelry but had to be protectively mounted to avoid accidental breakage. A typical specimen had a base value of 100 gp.