Art Deco 
Rene Boivin platinum, white gold and sapphire 'Ecrou' clip of geometric design, centring on a large collet-set cabochon sapphire to a tubular surmount wrapped in a line of channel-set angular sugar-loaf sapphires, to cabochon sapphire terminals, 1933. French assay marks, French maker’s marks, weight 26g.
Rene Boivin platinum, white gold and sapphire 'Ecrou' clip of geometric design, centring on a large collet-set cabochon sapphire to a tubular surmount wrapped in a line of channel-set angular sugar-loaf sapphires, to cabochon sapphire terminals, 1933. French assay marks, French maker’s marks, weight 26g.
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