Our opal inlay is a synthetic opal (harder than opal!!) which is made to look like Australian Opal. It is crafted in Sterling and then coated with Rhodium (member of the platinum family) so it won't tarnish. Once in a while you can just polish with a polishing cloth. Will not turn black like Sterling.
I have not yet uploaded all the earrings and rings but will so so soon.
Any questions, contact me at 978-852-0756 or sales@theburiedtreasures.com