Technical Opal Information

Conversion Chart for Ring Sizes

The Opal Body Tone Guide was designed and created by the Opal Association of Australia and is meant to be a guide for Black Opal and Boulder Opals.

We created a guide to all of the Ethiopian opals patterns and grading factors to help buyers with selecting the best possible opal for the price. It outlines the key features of this type opal.

Australian Boulder Opal Rough Chart

When it comes to talking about opals there are some terms that might seem a bit strange. Ratters, Nobbys, and Tailings are all part of the vocabulary of opal.

A Harlequin Opal is the rarest opal in the world. We will explain what is needed in a stone in order for it to be classified as a true Harlequin Opal an we will show some of the examples we have for sale.

One of the most important questions we get asked is how the backing of an Opal affects the value. We will take you through a step by step guide on what to look for.

The Opal has so many patterns that it is impossible to find two Opals that look the same. Check out our guide on all of the patterns that Opal can be found in

Synthetic Opal is a man made version of natural Opal. It has the exact same physical and chemical properties of natural Opal

Monarch Opal or Sterling Opal is a new type of synthetic Opal created by the same person that created the Zachery process for Turquoise. Lean about this Opals unique appearance and detection

A Black Crystal Opal is a unique and beautiful variation of a Black Opal. Black crystal opal is scarce and so unique.

What is play of color and do all opals display it? Learn about the fiery flash of color seen on precious opals, and the process behind this natural phenomenon!

Have you ever wondered what is the difference between an opal solid, doublet and triplet? Read our guide to learn the key features of each one of these three types of opal.

Opal is a striking gemstone featuring a beautiful play of color, but is opal a mineral or mineraloid? Learn the differences between the two and how gemologists classify opals!