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Untreated Australian Zircon 0.75

grean blue Australian Zircon in drop shape
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0.75 Carat (sold)
Greenish Sky Blue
Medium 55
Free of Inclusions



  • Identification: Natural Unheated & Untreated Zircon
  • Carat: 0.75
  • Shape: Pear
  • Measures: 6.58x4.16x3.20 (millimeter)
  • Color Grade: Very Good 
  • Tone: Medium 55
  • Color Zoning: Visible
  • Clarity: Free of Inclusions
  • Cutting Grade: Very Good+
    • Brilliancy: 75%
    • Depth: 76%
  • Origin: Australia
  • Treatment: None

Certificate No: IGI 181518055

Overall Grade: Very Good

Comment: Disclosure: We do usually not copy/paste our product descriptions, but in this case we need to repeat the following: Blue Zircon (from Cambodia) has been the one gem that I regretted not to trade because they are always heated. Now I was told that an Australian gold-miner found these light blue Zircons as by-product in his mine. I was more than intrigued and after some study I'm willing to trust: the blue is very bright, the stones are all very small, they show no sign of high-heat, and there are actually reports of natural bright blue Zircons found in Australia. We conclude that these Zircons had the luck to undergo a natural geological heat process like some Citrines do and as such are untreated by man.

About the gem: This 0.75 exhibits a slight color zone in the center; there the color is bright sky blue, while in the outer edges we get a more intense blue with a tint of green. The Pro knows that this unequal distribution is partly due to the cut (concentrating color in the ends) but a closer study under the lens confirms a true color zone in the center. Furthermore, the lens shows an excellent hand cut, but no inclusions whatsoever and no window. Unfortunately, we have no matching drop-shape in this size to make a pair and there is not much chance we get any more (what a pity!). That said, this little sparkler alone is showy enough to fill any ring without problem, or a lady's pendant for that matter. Remember, Zircons are as glitzy as diamonds but come with real colors.


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