A sapphire and diamond trilogy ring, featuring a large colour-change sapphire in octagonal-cut

A sapphire and diamond trilogy ring, featuring a large colour-change sapphire in octagonal-cut with an estimated weight of 20.52ct, approximately measures 16.2 x 12.3 x 9.9 mm, strongly dichroic and exhibits a change of colour from bright blue to purple when viewed under certain light sources, flanked by two emerald-cut diamonds in claw-settings, leading to a heavy D-section shank with size adjuster, white metal marked 'platinum', ring size R-W, total weight of item 22.0 grams. A verbal assessment of the Gemmological Certification Services confirms the sapphire with a Sri-Lankan origin, with no indications of heating. REF: 5783-3039Sapphire contains network of short rutile silk, feathers and graphite crystal inclusion.Colour change: blue to violetLWUV: moderate red; SWUV: inertestimated total diamond weight 1.90ct