- Black is very beautiful in this necklace in combination of size and color - the necklace begins with black matte beads & black glossy agate gemstones with subtle veins of brown and tan. Also strung in the necklace are beautiful marcasite stones in barrel & flower shapes, Swarovski multi faceted hematite crystal roundels, clear & jet Swarovski crystal bi-cones and sterling silver double daisy components - gun metal lobster closure - 28" length