Pendulum with Black silk stone earrings

▲▲▲ Black Silk Stone Geological Properties Onyx is a form of chalcedony, which is microcrystalline quartz formed in the gas cavities of lava. Its multi-layered structure is similar to that of agates. As with any onyx, black silk stone is found worldwide. Mineral Information: Oxide mineral Chemical Composition: SiO2 Color: Opaque-gray / black Hardness: 4 (Mohs) Specific Gravity: 2.70 Refractive Index: 1.486 - 1.658 ▲▲▲ Customers can select a variation of closure. https://c1.staticflickr.com/1/953/41861913431_fb577e2724_z.jpg ▲▲▲ Your item will come with our gift bag. https://live.staticflickr.com/65535/48641047828_8f0538660f_z_d.jpg ▲▲▲ Shipping World Wide : - Please allow us to prepare the item and parcel between 1-5 working days. - All items will be sent by Thai Registered Airmail. The delivery usually takes about 10 - 15 working days for parcel to arrive in most countries.