My blue Peruvian opal necklace has a hand forged toggle clasp or an alligator clasp if you choose. I love this color! It is warm and looks great on every skin tone. Even my model Jesse. Girl kitty. Though the rectangles would be good for a man as well. I use extra good, strong material to bead with, but it drapes well. The longest stones are 10x5 mm or 3/8" long. The strand is 16.5" long to wear as a choker. The toggle clasp is hand forged sterling silver. I like the soft rectangles because they are like pebbles on a beach, each different plus they have that buttery feeling of polished opal. Let me know if you need a longer length. This necklace comes with a black velvet drawstring bag.