Jade " Jade" in Chinese is also known as " Tiens ." In white, black , gray, orange, yellow and purple colors, many nuances and shades of green is a precious jade hundreds of thousands of years, in China , in order to protect the strength and quality of healing.It also said , stimulate creative thinking, strength and agility , enhance human health.Jade is to help a person, but in contact with it . Jade feels cool to strengthen and purify the mind , calm the mind and induce a meditative state . It is also considered a frequent cause jade stone processing , adds more beauty luster.According, Chinese have a saying , "Jade cool, because it is from a clear mountain stream nature ." Science " is a cool jade feeling, because it is a non -conductive Product Details - Shape / Type : Necklace / emerald necklace / green jade - Material / Gem : Emerald / fees brittle - Transportation / Handling : Standard international shipping ( 10-18 days for delivery ) - Level / Type: 100 / type / A level - Origin: China - Refractive index: 1.66 - 1.67 - Specific gravity: 3.33 - 3.34 - Colors and varieties: green, cold varieties - Weight (g / CT) 14.9 g / 74.3 kt - Size of 5mm beads - Luster: vitreous luster - Surface texture: medium-grained , This is the standard international shipping : give you 10-18 days , yes, We provide a tracking number , so you can keep track of all information . Registered mail , online message tracking number, Thank you so much ! Blessing !