5.18ct Unheated Ceylon Sapphire & Diamond Ring
Three things make a sapphire rare, and this one has all three on paper from GIA: it is natural, it is from Sri Lanka — the island the trade still calls Ceylon — and it shows no indications of heating.
That last line is the one collectors read first. The overwhelming majority of blue sapphires on the market are heat-treated to force their colour. This one never was: what you see is what came out of the ground. Unheated Ceylon material is a small fraction of supply, and it is priced accordingly.
The oval is a violetish blue, brilliant-cut crown over a step-cut pavilion, held in a double halo — an inner ring of round brilliants, an outer sunburst of tapered baguettes — so the stone sits raised and lit from every side.
Details
- ReportGIA Sapphire Origin Report 2205065975 (21 Feb 2019) - included
- Species / varietyNatural corundum - natural sapphire
- OriginSri Lanka (Ceylon) - GIA opinion
- TreatmentNo indications of heating
- ColourVioletish blue - transparent
- CutOval - brilliant-cut crown, step-cut pavilion
- Measurements11.90 x 8.28 x 5.50 mm
- Centre stone weight5.18 ct - client-stated on the report (see note below)
- SettingWhite metal - double halo, tapered baguettes & round brilliants
- Gross weight12.09 grams
About the carat weight
We would rather you hear this from us than find it yourself. GIA recorded the centre stone as a client-stated weight of 5.18 carats — because the sapphire is mounted, GIA did not remove it to weigh it. What GIA did test and confirm is everything that matters most: that the stone is a natural, unheated sapphire from Sri Lanka. The measurements on the report (11.90 x 8.28 x 5.50 mm) are GIA's own and are consistent with a stone of roughly that size.
The Finish
Each piece ships in a Bizak & Co. presentation box, fully insured and signature-required, with a certificate of authenticity. Exact carat weights, gold karat and ring size are confirmed in writing on request — examined personally by a trained gemologist.
The GIA report travels with the ring. Verify it yourself at GIA.edu before you commit — the number is 2205065975. More photos or a short video are yours on request, and we are happy for your own appraiser to check it. Make an offer above or message us on WhatsApp.
Before you buy: what makes a colored stone valuable · choosing a vintage engagement ring · how to care for it