The hexagonal diamond stone "Lonsdaleite", which is a rare gemstone, is one of the allotropes of naturally rare carbon, which is formed when meteorites collide with the Earth's surface. This form of carbon has a hexagonal crystal structure in the three-dimensional space, so lonsdaleite is called a hexagonal diamond. - 2 Lonsdaleite - chelle de Mohs 7 - Specific gravity 3.5 look at the pictures, thesewill tell much more than PAYMENT It is easy to use credit or debit cardpayments via Paypal and this is preferred. Payments not made within 7 days willreceive an unpaid reminder unless you contact me to make other arrangements. SHIPPING I will post all items and following fullpayment I will typically post within 3 business days. Contact If you have any questions please do nothesitate to contact me. I am always happy to assist. Returns accepted if product not as described, buyerpays return shipping fee; or keep the product & agree refund with seller