Home » Gemstones » Opal » Composite Opal

Opal Doublet or Opal Triplet


Pictures of Opal Doublet or Opal Triplet


assembled opals

Method of Stone Construction

Most cut opals are solid stones. The entire stone is cut from a single piece of rough (see top illustration). However, some opal rough has very thin but brilliant fire layers. Some artisans cut the stone down to the thin fire layer and glue it to a base of obsidian, potch or basalt - then cut a finished stone. These two-part stones are called "opal doublets" (see center illustration).

To protect the soft opal from abrasion and impact, a crystal clear top of quartz, spinel or other transparent material is sometimes glued onto the opal. This produces a three-part stone, called an "opal triplet" (see in the bottom illustration the clear cap, opal layer and base). The photo below shows two opal triplets, one face up and one upside down.




opal triplet


More Gemstones
  100+ Gems
  Emerald
  Diamond
  Amethyst
  Blue Gemstones
  Pictures of Opal
  Gemstones of the World
  Topaz

geology store

More From Geology.com:


Diamonds
Diamonds: Learn about the properties of diamond, its many uses and diamond discoveries.
Unakite
Unakite: A gem material composed of green epidote and pink orthoclase.
Labradorite
Labradorite: A feldspar that produces bright flashes of iridescent colors.
Where Do Bears Live
Where Do Bears Live in North America? Geographic range of grizzly, polar and black bears.
Geodes
Geodes look like ordinary rocks on the outside but can be spectacular inside!
Plate Tectonics
Plate Tectonics: Articles and maps about plate tectonics and the interior of Earth.
Peridotite
Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Abandoned Mine Accidents
Abandoned Mine Accidents take 20 to 30 lives per year. Many can be prevented with education.