What are Hybrid Gemstones?

The term “hybrid” hasn’t been clearly defined in the industry. Some use the term to refer to any combination of mined and synthetic material. This includes assembled gems such as doublets, triplets, and mosaics.

Others will only apply the term to stones where differentiating the natural material from the treatment is difficult, if not impossible. These stones may be the results of reconstitution, polymer impregnation, or leaded-glass treatments.

Growing lab-created material over a mined gem can also create hybrid gemstones. Although such synthetic overgrowth is uncommon in today’s colored gemstone market, older stones occasionally resurface. Diamond hybrids are somewhat more common. These can contain a chemical vapor deposition (CVD) layer over natural diamond to increase weight or improve color. Other diamond hybrids have a layer of diamond-like carbon (DLC) over a non-diamond, colorless gemstone.

Leaded-Glass Rubies

Most who use the term “hybrid” first applied it to ruby-glass mixtures. This includes both fracture-filled stones and composites made of several small pieces of ruby in a glass matrix. In some cases, the glass component constitutes a significant portion of the stone’s size and weight. In extreme cases, the gemstone would hardly exist without the glass component. Some…