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 meditative state. It is also believed that jade frequent handling can cause the stone to grow more beautiful luster . According to a 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 . Jade , or " jade" in Chinese is also known as " Shitian Tang ." Come in green and white , black , gray, orange, yellow and purple hues are many nuances shades , jade is prized in China thousands of years to protect its power and healing required quality stones. It is also said to stimulate creativity and mental agility , and improve a person 's health. Product Details Shape / Type: pendant / charm / necklace Material / Gem : Emerald / cost attenuation / A Jade Number : F601 Country of Origin: China Refractive index: 1.66 to 1.67 Specific gravity: 3.33 to 3.34 Emerald color varieties : green color, hardy varieties Weight (g / ct ) : ~ 20.38 g / 56.9 kt Luster: vitreous luster Surface texture : medium grain Condition: Excellent Freight Policy: Standard international shipping 10-18 days to send to you Yes, we offer a tracking number so you can keep track of all the information . Registered mail All our packages will be shipped by registered mail with a tracking number online Thank you for reading , if you have any questions , please contact me.