5.29 ct Oval Ruby, GRS, Tanzania Unheated

5.29 ct Ruby, oval cut, from Winza, Tanzania. Unheated: the colour is as the stone formed, with no heat treatment. GRS report GRS2013-044461. Measurements: 12.07 × 9.48 × 5.00 mm. Our grading: crystal material; orangy-red. Stock number CS-0418. 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.

Crystal material. Its laboratory report is from GRS (GemResearch Swisslab), a Swiss laboratory widely used for coloured stones. Its length-to-width ratio is 1.27. Large enough to anchor a statement ring or pendant.

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Further reading: Reading a GRS Report: Pigeon's Blood, Royal Blue, Vivid and the Comments Line · Rubies, Sapphires and Emeralds: Origin, Treatment and Value