Shell heart Cut stretch rings. Shell warms to body temperature., Very comfortable stacking rings-are all one of a kind. The stretch rings are for the comfort of summer and beach life. These are all hand strung natural shells. Very flat and comfortable. These are all one of a kind as pearls are all one of a kind. The pearls are chosen for their soft lister and glow, shape and colour. Luster. Natural stones warm up to body temperature and are great for energy. Hypoallergenic