Vintage Colour-Change Sapphire Ring bangles London hallmarks confirm the gold

London hallmarks confirm the gold

Era: Vintage 1990s

Era: Art Deco circa 1925

Head size: 10mm by 7

15ct gold ring

Vintage Colour-Change Sapphire Ring bangles London hallmarks confirm the goldStriking vintage 'picture frame' ring featuring a remarkable colour change sapphire set within a glistening diamond border. The principal, flame fusion stone appears blueish in daylight and bright purple under electric light; the effect is created by the inclusion of vanadium and chromium colouring elements. It's crafted in 18ct gold with London hallmarks from the year 1993, the bimetal design and pretty trifurcated shoulders are both very much in the