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A topaz and diamond cluster ring, by Stern, circa 1970. photo courtesy Bonhams

The oval fancy-cut topaz within a tiered border of marquise and tapered baguette-cut diamonds, to bifurcated shoulders, topaz approximately 21.50 carats, diamonds approximately 4.30 carats total, partially indistinct H Stern signature, ring size L Estimate: £10,000 - 15,000

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A pair of topaz, hessonite garnet and diamond floral earclips, by Boucheron, circa 1940 photo courtesy Bonhams

Each earclip designed as a single bloom, the marquise-cut stamen within unfurling pear-shaped and circular-cut topaz petals with rose-cut diamond detail, the leaf and stem further accented with rose-cut diamonds, signed Boucheron London, length of each earclip 2.0cm., cased by Boucheron, 26 Paris Place Vendome, New York 1 East 57th Street, 180 New Bond Street, London. Estimate: £4,000 - 6,000

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A mid 19th century topaz brooch. photo courtesy Bonhams

The central step-cut topaz, within a repoussé quatrefoil border, length 4.0cm. Estimate: £3,000 - 4,000

Bonhams. Fine Jewellery, 22 Sep 2010 New Bond Street www.bonhams.com