A belle époque emerald and diamond brooch/pendant, circa 1910. Photo Bonhams

Set to the centre with a square-cut emerald and single-cut diamond cluster, to an openwork border set with swags and floral garlands, within a quatrefoil frame, millegrain-set throughout with single and brilliant-cut diamonds and calibré and circular-cut emeralds, diamonds approximately 4.80 carats total, detachable brooch fitting, one emerald deficient, length 5.2cm. Sold for £23,750