An opal doublet and diamond brooch, by Andrew Grima, 1968, designed as a stylised flowerhead, the textured gold plaque set with oval and circular-shaped black opal doublets, accented with courses of round brilliant-cut diamonds, signed Grima, workshop mark HJCo., mounted in 18 carat white and yellow gold, London hallmarks, 1968, gross weight 40.8 grams, width 6.5 cm