7.5mm graduating slightly to 8mm in diameter, these Black Spinel faceted rondelles have been faceted creating a symmetrical shape for these opaque, natural black hued beads with perfectly matching quality. One of the few finished jewelry items in our inventory, our custom made Black Spinel Necklace has been strung on multi-strand stainless beading wire and finished with 14 karat yellow gold stamped findings. There are 260.5 carats total weight in natural Black Spinel. Your ideal basic black necklace is ready to wear. AA grade