Types of Composite Opal

Composite opals combine the natural beauty of the gemstone with innovative craftsmanship. 

A composite opal is created by combining a layer of natural opal with backing materials. The slices of genuine opal used in composites are usually thin enough that they are too small and delicate to be used on their own. Backing and layering these fragments allows jewellers to showcase the aesthetic value of opals in a new, unique piece.

The chemical composition of an opal is made up of microscopic spheres of silica, arranged in a grid. This is what creates the distinctive play of colour opals are renowned for.

Composites retain this effect, but distinguish themselves from solid stones in other respects. Read on to learn more about the different types of composites available, or see our blog on the differences between natural and synthetic opals for a specific comparison between these two variations of the gemstone.

What is a Doublet Opal?

A doublet opal is made from two layers: a thin slice of natural opal and a backing material. The latter is usually either potch (common opal) or another colourless opal.

The dark base enhances the natural opal’s colour, adding more contrast to the finished piece. Doublets can be very aesthetically pleasing, with bright streaks of colour flashing across the surface as light hits them.

Doublets strike a balance between appearance and value, with a high-quality natural look.

When it comes to caring for a doublet opal, it’s important to make sure they are not exposed to water, as this can soften the adhesive bond between the layers.

What is a Triplet Opal?

Triplet opals are made of three layers: a thin slice of natural opal and a dark backing – like a doublet – and a transparent protective cap. This top layer magnifies the opal beneath and serves as a protective barrier for the stone.

As a result, triplets can be very vibrant pieces, with the play of colour amplified by the glossy top layer. Like doublets, it’s best to avoid exposing opal triplets to water to maintain adhesion between each layer.

Compared with other composite opals, the triplet’s combination of value and aesthetic appeal cannot be beaten for many buyers.

What are Mosaic or Chip Opals

Mosaic opals, also known as opal chips, are arrangements of small opal fragments. These are set into a backing material and sealed with a clear top layer to create one stone.

Unlike doublets and triplets, mosaic opals are made with many smaller pieces of the stone, rather than a single slice. 

The result is a distinctive opal with a beautiful, patchwork-like appearance. Multiple flashes of colour each move across the stone in different directions.

Final Thoughts

Composite opals are an attractive form of the stone. They highlight the skill and craftsmanship of master jewellers in transforming fragments or thin slices of opal into stunning pieces using high-contrast backing materials or unique arrangements.

Whether it’s the simplicity of a doublet, the layered beauty of a triplet or the captivating creativity of a mosaic opal, composites offer a visually appealing, affordable alternative to the prized naturally formed opal.

Shopping for your next piece? Visit our Sydney flagship store to browse opal, pearl and diamond jewellery from our collection.