Vintage Amethyst & Pearl 9k Gold Brooch - 6.4 Grams - HBJ - London It is fully hallmarked with the London assay mark, a crown, 375, the makers mark(HBJ) and date letter "L"(it is very small but looks like an "L") which dates it to 1985. Excellent and perfect new condition It measures approx 3.3 cm long Weighs 6.4 grams.