Jade is believed to be able to help a person in contact with it. Jade cool feeling, is said to enhance and purify the mind, calm the mind and induce a meditative state. It is also considered jade frequent operation may cause the stone to become more beautiful sheen. According to the Chinese proverb, "Jade is cool, because it is clear from the nature of the mountain." Science says, jade is a cool feeling, because it is a non-conductor. Product Details - Shape / Type: necklace / charm - Material / jade stone: Natural Standard international shipping (10-18 days) delivery - Class 100 / / / Type: Dimensions: 16 mm - Refractive index: 1.66 - 1.67 - Specific gravity: 3.33 - 3.34 - Emerald varieties and colors, green - Weight (grams / CT scan) 13.35 g / - Luster: vitreous luster - Good condition: Standard international shipping 10-18 days to send to you Yes, we provide a tracking number, so you can keep track of all information. Registered mail All our packages via a tracking number will be shipped by registered letter online