Learn about Opal

Opal is the birthstone for October measuring 5.5-6.5 on the Mohs scale of hardness, and is primarily produced in Australia. Opal can contain up to 20% water and this can make it potentially quite brittle and easily chipped. Opals can be made into a doublet or triplet which is a form of treatment - section of the opal is backed with epoxy resin creating a doublet or topped with resin to create a triplet. This adds thickness, strength and weight to pieces otherwise thin or brittle. Find out more....

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Related Opal Articles

  • Opals - Part 4

    Opals - Part 4

    In part 4 of our series on opals, learn about which type of this dazzling stone you would prefer!

      4 Dec 2011
  • Opals - Part 3

    Opals - Part 3

    Opal is a kind of hydrated silica gel which comes in two varieties. This article gives you all the information you need when choosing an opal.

      18 Nov 2011
  • Opals Part 1

    Opals Part 1

    Part one on the beautiful gemstone that are opals and how their internal structure makes all the amazing colours we see. Also looking at how the you cut, clean and polish opals.

      28 Jun 2011