18th century old mine cushion cut diamond button-back ring, c.1780, larger diamond to centre in a two-row graduated border,

18th century old mine cushion cut diamond button-back ring, c.1780, larger diamond to centre in a two-row graduated border,
Price: £20,000-£50,000
Ref No. 06505
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Description
old mine brilliants and double-eight cuts to the outside, close cut down collet set in silver and gold, fluted to the back, trifurcated foliate shoulders with fluted shank, the shank probably slightly later added
Width 1.6cm / 9/16''
Central diamond spreading approximately 6.1 x 6.1mm
Weight: 7g
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S.J. Phillips