Vintage Unusual Modernist Malachite & Sterling Silver Brooch, the large malachite gemstone is beautiful. The brooch is hallmarked with "sterling" for sterling silver and was made in America as well as full British import hallmarks on the pin which are the makers mark "WSG", 925, the London import mark and the date letter "T" for 1993. It measures approx 5.0 cm across. It weighs 17.9 grams. The brooch is in excellent condition.