Mawsitsit Jade is mined only in Cambodia and is a very rare nephrite,the one in the necklace is over 10 grams of its highest quality with a very high polish due to its hardness and durability.The green moss with the carbon in the nephrite is part of the characteristic of the stone and the green moss is the fundamental valuable natural composition that adds up the dollars/gram to the ore.Most of the ore is a pale pastel light green toned material which you can see on a couple of spots in the center of the species. 19 INCH LONG CHAIN GEMSIZE: 1.5"x 1"x 0.25"