An early 20th century sapphire and diamond brooch


The octagonal-cut sapphire within an openwork lozenge-shaped surround of garland design, with foliate detailing, set throughout with old brilliant, rose and single-cut diamonds, mounted in platinum and gold, sapphire approximately 11.20 carats, principal diamonds approximately 0.80 carat total, later pin signed Koch, Russian import mark, possibly composite, length 3.6cm, fitted case by S.J.Phillips
|Accompanied by a report from The Gem & Pearl Laboratory stating that the sapphire is of Sri Lankan origin, with no evidence of heat treatment. Report number 16902, dated 26 February 2019.