Opal, the birthstone for October, is one of the most spectacular gemstones. A single stone can flash every color of the spectrum with an intensity and quality of color that can surpass the fire of diamond. This post was updated in October 2019.
The best opals can command prices per carat that rival the most expensive diamonds, rubies and emeralds.
A Softer Stone
Origin and Types of Stone
Opals can be found all round the world but the most precious deposits are in Australia. Retailer Gemporia has recently started selling new varieties from Ethiopia. There's a nice story relating to this on their website.
A Stone With Many Names
If you've been looking at opals you'll probably be aware they come with many different names. There are three basic types of opal, Precious Opal, Common Opal and Fire Opal.
Precious Opal flashes iridescent colors when it is viewed from different angles, when the stone is moved or when the light source is moved. This phenomenon is known as a "play-of-colour". Precious opal can flash a number of colors such as bright yellow, orange, green, blue, red or purple.
Common Opal doesn't exhibit play of color but some specimens can be cut into gemstones that accept a high polish.
One thing that an opal isn't is a moonstone. A moonstone is a gemstone from the feldspar group. Meanwhile a "moodstone" is just glass, and its trade name is Opalite.
Is there Opal on Mars?
There may or may not be life on Mars but there are certainly opals, as discovered in 2008 by NASA's Mars Reconnaissance Orbiter.Here I'm wearing an opal ring which I was gifted from Gemporia, 08.carat of opal from the Australian Coober Pedy mine, set in 9K gold. I love the way the stone has a beautiful iridescence when you look at it in certain lights.
Have you got any opal jewellery? Do share in the comments below.
Discover the stories behind your birthstone
Check out Is This Mutton's popular series on birthstones: Garnet, January; Amethyst, February; Aquamarine and Heliotrope, March; Diamond, April; Emerald, May; Pearl and Moonstone, June; Ruby, July; Peridot, August; Sapphire, September; Opal and Tourmaline, October; Topaz and Citrine, September; Tanzanite and Zircon, DecemberMy Opal Picks
Is This Mutton? has a jewellery / jewelry board on Pinterest featuring the gemstones which have been showcased so far in the monthly series on birthstones.
I am in love with that first ring!!
ReplyDeleteThat first ring is calling me :) Lovely post Gail. Thanks for sharing at Welcome To The Weekend Blog Hop.
ReplyDeleteGeez, every month I find a new favorite. Although, opals have been a fav for a long time. My first boyfriend gave me an opal ring that was a treasure but extremely delicate. My daughter loves opals so much that her engagement ring features the gem rather than a diamond. Lovely pieces, Gail.
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