My own artisan creation using copper colored (dyed) keshi pearls for a simple but unique necklace. Keshi pearls are small non-nucleated pearls formed as by-products of pearl cultivation. These nucleus-free pearls form in the cavities where the first generation pearls once grew. Technically they are totally pearl nacre,, but also technically not natural as they would not exist if not for another pearl being cultivated. I love the look of this variety, sort of like a copper colored corn flakes. No clasp, I strung this without one to slip over the neck. It measures 26" or more around. Each keshi "pearl" measures 3/8" to 1/2" long.