I'm doing some winter cleaning and selling some of the gemstones and jewelry-making supplies from my collection.
These stones were part of a jeweler's collection that I purchased at an estate sale, and I listing a few more from the same estate.
The opal colors are more intense than the photos show. This listing is for 2 genuine opal doublets with a black backing, but there is some paper stuck to the backs that will come off with warm water. These date from about the 1970's.
Each of these stones measures about 8mm diameter, with depth of about 3.5mm.