I have an antique ruby ring that was recently appraised as a synthetic doublet. What does that mean?

A doublet is an assembled gem.  This means that two different materials were adhered together to create one stone.  In the case of your antique ruby, the top of the stone (crown area) is a genuine piece of ruby that was glued to a synthetic ruby (pavilion area).  Sometimes the entire crown can be composed of natural ruby or it can just be a small portion of the crown area.

There are many kinds of assembled stones that are used to imitate many different natural gems.  Garnet and glass, sapphire and synthetic sapphire and synthetic spinel and strontium titanate are just a few.  There are also triplet assembled stones.

Triplets are usually two different stones adhered together with a colored layer of cement to imitate a natural stone. Opal triplets are very popular and consist of a black plastic bottom, a thin layer of natural or synthetic opal and a clear quartz top.


The production of assembled stones dates back as far as the 19th century.  Many of these are very difficult to detect and require an expert gemologist to do so.  These doublets and triplets are quite common and if you want to be positive of what you have, stop in and ask our expert gemologists.  We will be happy to run the appropriate tests to determine the real identity of your heirlooms. We offer while you wait appointments and drop off service.

*Photos courtesy of the GIA.