I have sold many of these and I am afraid I do not know what the black material is. Could be ebony? This one is particularly nice, 18K gold accents with red coral. Marked on the bottom "18K ITALY CORLETTO". Just stunning right down to the little earrings....but the face needs a clean - I do not mess with old jewelry but it shows in the picture. It still has the original gold ring attached ready for chain. Including the ring it measures 1 1/4 inches long.