Vintage diamond engagement ring from the Art Deco era, circa 1935, set with a 0.90ct square emerald-cut diamond, available from Berganza in Hatton Garden, London (£9,900).

Vintage diamond engagement ring from the Art Deco era, circa 1935, set with a 0.90ct square emerald-cut diamond, available from Berganza in Hatton Garden, London (£9,900).

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