6 Facts You Should Know About Opals

  • Opals flash beautiful colours as you turn the stone or move around it. This phenomenon is called play-of-colour. An opal might show a single colour, two or three colours, or an entire rainbow.

  • Opal is the birthstone for the month of October.

  • The best play-of-colour is the brightest; an opal displaying a full rainbow is the most rare and valuable.

  • Opals are known by their background colours and are called "black," "white," "gray," or "fire" opals.

  • Once the rough opal is cut and polished, the play-of-colour will be brightest.

  • Opals rate 5.5 to 6.5 on the mohs hardness scale, and require special care when worn in jewellery. 

July 10, 2014 by Perrine Comeille
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