18th century cushion cut diamond cluster brooch, c.1780, formerly a button,

18th century cushion cut diamond cluster brooch, c.1780, formerly a button,
Price: £20,000-£50,000
Ref No. 04992
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Description
the largest stone to centre, bordered by three rows graduating smaller to the outer edge, close cut down collet set in silver, later added brooch fitting, the central diamond very approximately 1ct
Width 2.6cm / 12''
Central diamond approximately 6.50 x 5.50mm spread
Weight: 17g
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