5.63 ct Oval Blue Sapphire, GRS, Thailand Unheated

5.63 ct Blue Sapphire, oval cut, from Thailand. Unheated: the colour is as the stone formed, with no heat treatment. GRS report GRS2026-020990. Measurements: 12.02 × 10.13 × 5.63 mm. Our grading: fine quality vivid-deep blue. Stock number CS-0058. The video on this page was filmed in our office, unedited and unfiltered. Approved trade buyers can sign in on this page for pricing, or WhatsApp or email us about this stone. Viewings by appointment in Toronto, Hong Kong, Bangkok and Dubai.

“Vivid” in its colour grade marks the most saturated level of colour. Its laboratory report is from GRS (GemResearch Swisslab), a Swiss laboratory widely used for coloured stones. Its length-to-width ratio is 1.19. Large enough to anchor a statement ring or pendant.

More like this: Blue Sapphires · Unheated Sapphires · Unheated Gemstones · Stone search

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Further reading: Reading a GRS Report: Pigeon's Blood, Royal Blue, Vivid and the Comments Line · Heated vs Unheated Sapphire: What the Difference Means for Price