Here is a set of 2.00ct Semi Black Doublet Opal Earrings in 14k gold. This set is part of a collection of estate jewelry that will be auctioned this week. The Opals went to the gem lab this week- and he called confirmed them to be Natural Semi Black Opal Doublet Ovals. They have lots of pretty colors and they can be worn without having your ears pierced. Opal is the October birthstone. This set will be auctioned to the highest bidder at $1 No Reserve.