This is a pendant with a rare combination of a platinum-based precious opal rough, Paraiba tourmaline, and diamonds. The top is platinum 900, and the chain is a platinum Venetian chain 850 that can be adjusted. The "0.03" engraving indicates the size of the Paraiba tourmaline. The carat weight of the opal and diamonds is unknown. Milgrain detailing surrounds the Paraiba and diamonds, showing meticulous craftsmanship. I was very fond of this piece, with its beautiful precious opal that has a transparency like a rainbow trapped in a water droplet and wonderful play-of-color, but I haven't had the opportunity to wear it, so I'm putting it up for sale. The Paraiba is a clear, blue-toned Paraiba tourmaline. No gemological identification report is included. Please comment if you are interested. The case is not included.