M Mabe - A Japanese term for half-sphere pearls, which are cultured against the shell so that only half a pearl is formed. Malachite - A mineral which is characterized in appearance by bands of light and dark...
Investing in tourmaline is made much easier by the lack of lab imitations, although glass is sometimes sold to the unwary. Tourmaline investment probably suffers most from simply having too many choices....
Ethiopian opal is still a new gemstone. Ethiopian opal is quite unique and different from more common Australian and Mexican opal. Not many people know about this opal yet. I am a gem cutter and have worked on...