Handmade. Elastic stretchable, the beads are very highly polished, which gives a very nice effect and they are also selected in a beautiful blue color. Genuine Larimar: Glows slightly white or greenish-blue under UV light Beautiful larimar is tested by a jeweler but you can also check it yourself if it is real larimar: when you rub it against your tooth the stone is rough like sand and if it is not real it is very smooth like glass or plastic. This is an old method of checking whether a coral, pearl or a natural stone. Length / Circuit: is 16 cm I can advise you to choose a size from 14,5 cm to maximum 15,5 cm / Diameter stones 1,0 cm Weight: 20,8 grams Larimar is the tradename for a rare blue variety of the silicate mineral pectolite found only in the Dominican Republic, around the city of Barahona. Its coloration varies from bluish white, light-blue, light-green, green-blue, turquoise blue, turquoise green, turquoise blue-green, deep green, dark green, to deep blue, dark blue and purple, violet and indigo and the larimar can come in many varieties and color mixes. Shipping registered.