Yu is considered to help a person , but in contact with it . Yu said that to enhance the feeling of cool and purify the thoughts , quiet the mind and induce meditative state. It is also believed to cause frequent handling of jade stones grow more beautiful luster. According to a Chinese proverb , "Jade is cool because it comes from the essence of a clear mountain stream ." Science " says Jade is a cool feeling , because it is a non-conductor . Many Chinese people believe that a jade stone eventually become a part of life , its owner. Yu said that change color depending on its own aura. Or depressed when he or she may be a darker shade of jade . If we are lucky , the stone may be lighter shades. Product Details - Shape / Type : Ring / Charm - Material / Gemstone : Emerald / - Shipping / Handling : Standard international shipping ( 10-18 days delivery ) - Level / Type: 100 A / A type / A type - Country of Origin: China - Colors and varieties : green, icy varieties - Weight ( g / CT): ~ 14.9 g / 74.3 kt - Luster: vitreous luster - Surface texture : medium grain - Condition: Excellent Shipping Policy According chargeable weight ( NW ) , transport / handle is to be charged , chargeable weight is listed in the item description , S / H rates are listed in the chart below EMS: express mail service, 4-8 days to USA, Canada , UK, Australia and other places , S / H charges , other counties different Standard International Shipping: Global 10-18 days package 2kg or less. S / H in the United States than in other countries different from 2 kg bag fee Registered mail ( free online tracking number ) All of our package will be shipped with online tracking number , by registered mail , I'm sorry , we do not send packages unregistered . 100% Satisfaction Guaranteed If you are not completely satisfied with our products , please email us immediately and return them within 7 days of the date you receive them for a full refund . No restocking fee will be charged .