I have seen a Terengganu pipit teleng hilt made from black coral. It's a good sized hilt, beautifully carved, and almost all black with minimal specks and sand pits. It was brightly polished and reflects light like polished black marble.
Unfortunately, it was not for sale.
This material is devilishly hard to carve and polish. Sorry, no pictures to share...
Dave has a good sized kerdas hilt on a Bugis naga keris.