Sterling Silver Marcasite Pearl Garnet House Style Large Spider Brooch. M343. Complementing our sterling silver and enamel designs, the introduction of sparkling and natural marcasite stones provides a classic and elegant way to accessorise any outfit. With a certain Art Deco feel, accompanied by Derbyshire Blue John and Garnets, the collection features wonderful insect earrings, brooches, rings and pendants. This unique large spider brooch is handmade in sterling silver and features a large, lustrous Freshwater Pearl for the abdomen and two Garnet eyes. The thorax is accented with sparkling Marcasite gemstones.