K COL mark

by sarah Deane
(gold coast)

Hey i have a small gold/shell cameo pendant with a woman's bust that has a gold mark "K COL" on the pendant tip. I was wondering what that means. It has no gold hallmarks to say where/when it was made or if it's actually gold, also i can see the carving marks on the shell so i asume it is real cameo, i found it in an op shop. Please help me, i can't find anything on the internet or in books.