15.05 ct Cushion Blue Sapphire, GRS, Ceylon Unheated

15.05 ct Blue Sapphire, cushion cut, from Ceylon. Unheated: the colour is as the stone formed, with no heat treatment. Sri Lanka (Ceylon) is known for bright, lively sapphires across the colour range, including padparadscha. GRS report GRS2025-057784. Measurements: 15.33 × 12.42 × 7.85 mm. Our grading: gem quality vivid (royal) blue. Stock number CS-0068. 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.

Royal blue, in its colour grade, describes a deep, rich, velvety blue, among the most valued sapphire colours. It is documented by GRS (GemResearch Swisslab), a Swiss laboratory widely used for coloured stones. Its length-to-width ratio is 1.23. A collector’s size, suited to a signature ring, pendant or a stone kept loose.

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

Similar stones: 12.07 ct Oval Blue Sapphire, GIA, Ceylon Heated · 12.53 ct Cushion Blue Sapphire, GRS, Ceylon Unheated · 13.82 ct Round Blue Sapphire, Ceylon Heated · 14.27 ct Oval Blue Sapphire, GIA, Ceylon Heated · 15.60 ct Oval Blue Sapphire, Thailand Heated · 16.05 ct Oval Blue Sapphire, GIA, Unheated · 18.96 ct Cushion Blue Sapphire, GIA, Unheated · 20.41 ct Round Blue Sapphire, Ceylon Heated

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