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 the 2 opal doublets with a black backing featured in the photos. These date from about the 1970's.
Each of these stones measures about 10mm x 5mm, one has a depth of about 3mm and the other is about 2.5mm.