Common Opal Varieties


Real, Natural Opal
Many Colors, Shapes, and Types!

Natural Opal: Real, natural opal has not been changed from its natural state--except to be cut an polished into a gem stone. The Opal Man carries many types of natural opal, including Australian black opal, crystal opal, white opal, boulder opal, and opal specimens. The opal doublets we carry are also made from real, natural opal material. (More on opal doublets, below). We also carry real, natural opal from Mexico and Ethiopia.

The specimen shown here shows striated opal material deposited on its host stone, Australian ironstone.  It is cut and polished, and it is from Queensland, Australia.


Australian Black Opal

Australian Black Opal is one of the most well-known and valuable types of opal. While some people mistakenly expect black opals to be very dark or black, the name actually comes from the color of the host stone where the opal formed. This host material, which can appear a range of tones from gray to black, is naturally occurring and can often be seen on the back of the polished black opal. The stone cutter did not remove the dark, opaque background because it has the effect of enriching and saturating color, and it increases the value of the stone.


Australian White, Light, and Crystal Opal

White opals have a white base, and the color play and patterns present themselves in this white opal base. Opals in this category can host a wide variety of colors and light play patterns. White opals may be the most common type of opal because they were marketed well early in the 20th century. Customers who come to The Opal Man for the first time are often surprised to see all of the other colorful of opal we carry. White opals are often the most difficult to photograph, too, because their colors can be so pastel and delicate.

In a crystal opal, on the other hand, the color play presents itself against a transparent or translucent opal base. Light can pass through a crystal opal and light opal, where it cannot, generally speaking, pass trough a black opal.


Australian Boulder Matrix Opal

Boulder opal is found in select areas of Queensland, Australia.

The term boulder comes from the ironstone on which the layer of opal is formed, often giving the opal an uneven surface that further enhances the array of colors. The material is cut and polished with the opal material still attached to the parent material (e.g. ironstone) on which the opal formed. Boulder opal presents beautifully in jewelry of all types, including men's jewelry.

When the parent stone is visible alongside the opal, as in the pendant shown here, it is called boulder matrix opal.




Koroit Boulder Opal

Koroit boulder opals are found exclusively on the opal fields of Koroit, Australia. Durable stones, these stones are among the hardest opal material of all boulder opals. Unique, artistic design and beautiful patterns of vibrant color are characteristic of Koroit boulder opals. They make stunning pendants and rings, and they stand out in a gem collection, too!


Doublet Opals

Doublet opals can have a wide range of striking, beautiful color play and flash. A doublet opal is comprised of two layers, a top layer of real, natural opal bonded to a bottom layer of darker stone. Natural Australian ironstone or black onyx is often used for this second layer. The addition of the darker material can give the visual effect of deeper, saturated colors, like a black opal. The Opal Man makes doublet opals here in the shop.

In the picture shown here, the two layers of the doublet are distinctly visible.


Opal with Treated Matrix

Some opal forms in or on a porous, white parent stone, called the matrix. This type of lighter matrix stone, often found in Andamooka, Australia, can be treated so that it looks darker. Treating the matrix in this way can make the colors of the opal material look more vibrant and saturated than it would look against a white matrix. It is important to note that treating the opal matrix does not alter Australian opal, just the parent matrix.  At The Opal Man, opals are always identified, so customers know what types of opal they are seeing.


Mosaic Opal

When small pieces of natural opal are put together to fill larger spaces or to make designs, we call it mosaic opal or opal mosaic. Mosaic opal can be made from opal pieces of various shapes and sizes. In the picture shown here, the turtle's shell is made of medium size natural, Australian opal pieces. This turtle design was created at The Opal Man. The body is sterling silver, and the turtle's shell is Australian opal. Opal mosaic triplets are sometimes made with mosaic  comprised of very small pieces of opal.


Other Types of Opal

The Opal Man carries many varieties of opal. Please stop in and see us some day!

The opal figuring pictured here is made from carved Mexican opal.