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. - Échelle de Mohs 7 - Specific gravity 3.5 look at the pictures, these will tell much more thanPAYMENT It is easy to use credit or debit card payments via Paypal and this is preferred. Payments not made within 7 days will receive an unpaid reminder unless you contact me to make other arrangements. SHIPPING I will post all items and following full payment I will typically post within 3 business days. ContactIf you have any questions please do not hesitate to contact me. I am always happy to assist. Returns accepted if product not as described, buyer pays return shipping fee; or keep the product & agree refund with seller