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
  Mineral collectors
  United States Gemstones
  Diamond
  Ruby and Sapphire
  Pictures of Opal
  Emerald
  Tiffany Stone

geology store

More From Geology.com:


US Gemstones
United States Gemstones: A diversity of gemstones are produced in the United States.
Green Gemstones
Green Gemstones - emerald, peridot, jade, tsavorite, chrome diopside, chrysoprase, and more.
Rock and Mineral Kits
Rock, Mineral and Fossil Collections: Nice kits for personal or classroom use.
gem photos
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Chalcopyrite
Chalcopyrite - The most important ore of copper for over five thousand years.
Tsunami Causes
What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis.
Tanzanite
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Azurite
Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.