Technical Opal Information

Black Opal Brightness and Body Tone Guide

Black Opal Brightness and Body Tone Guide

The Opal Body Tone Guide was designed and created by the Opal Association of Australia and was meant to be a guide for Black Opal and Boulder Opals. The Opal industry has recently also been using this guide for many Opal types including Ethiopian
  • 6th Nov 2016
  • 28
  • 2
Conversion Chart for Ring Sizes

Conversion Chart for Ring Sizes

Conversion Chart for Ring Sizes
  • 27th Sep 2015
  • 6
Ethiopian Opals Grading And Patterns

Ethiopian Opals Grading And Patterns

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.
  • 23rd Feb 2016
  • 31
Glossary Of Opal Terms

Glossary Of Opal Terms

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.
  • 11th Apr 2016
  • 5
How Does The Back Of An Opal And Its Cut Determine The Value Of An Opal?

How Does The Back Of An Opal And Its Cut Determine The Value Of An Opal?

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.
  • 1st Feb 2016
  • 4
What is a Harlequin Pattern Opal?

What is a Harlequin Pattern 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.
  • 5th Apr 2016
  • 10

Hello! Opal Auctions is an international marketplace offering Opal Stones, Rough & Jewelry from professional Opal cutters, dealers & miners. Register for $10 off your first purchase.