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Unheated Ceylon Ruby 1.68

ruby from Ceylon untreated and roundish
more images
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1.68 Carat
Rose Red
Medium Dark 70
Lightly Included





- Identification: Natural Unheated & Untreated Ruby

- Carat: 1.68

- Shape: Roundish Oval 

- Measures: 6.77-6.12x4.37 (millimeter)

- Color Grade: Very Good

- Tone: MD70

- Color Zoning: None

- Clarity: Lightly Included

- Cutting Grade: Very Good

o       Brilliancy: 80%

o       Depth: 71%

- Origin: Sri Lanka

- Treatment: None


Certificate No: IGI 214674151 & GIA 7132144020


Overall Grade: Very Good

Comment: IGI could not decide on origin, GIA came down in East Africa, and I claim Ceylon or modern Sri Lanka. Supply-chain control aside, this 1.68 behaves on photo exactly like many other corundum's from Ceylon (our major area of expertise). In any case, at the time when these gems were 'made' by earth these continents were all part of the supercontinent Gondwana. The unique gleam shown on the 2nd front shot under 'more images' is caused by what in Sri Lanka is called 'diesel'. This silky crystal can be so thick that the gem looks almost white (then called 'diesel gueda') and can only be used as 'gem' after intense heat treatment. Obviously this is not the case here, but under the camera many Ceylon sapphires show exactly the same unexpected reaction as this ruby, a silvery gleam that remains invisible to the eye but pops-up for example in the handshot below. This is always mixed with the fluorescent effect of ruby but has its own character (also in SLR141 or CCS109 or SSS145). That said, we here have a full sized ruby without window, no eye-visible inclusions, nor treatments (our ideal three 'no-no-no'). GIA graded it as a pure 'red', IGI judged 'purplish red'. The main image represents the gem's color best, a rock-solid full red, not hot pink, not brown-red, never pale, never dark. Full luster, especially for a ruby. Double 'no heat' from two of the world's biggest and well reputed gem labs (wax is only a residue from cutting not an enhancement) Mathematically oval but easily perceived as round-ish. At under $8k/ct a solid offer in unheated ruby, not as exclusive as fine Burma material but probably equally rare, statistically as I mentioned elsewhere since Ceylon does not produce much ruby (anymore?).


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