A late Victorian turquoise and diamond clover leaf brooch

A late Victorian turquoise and diamond clover leaf brooch, the three leaves each set with a cabochon-cut pear-shaped turquoise to the centre of a cluster surround of old-cut diamonds, to a diamond-encrusted stalk, the diamonds estimated to weigh a total of 1 carat, all cut-down set in silver with yellow gold back, gross weight 4.2 grams, circa 1900,