This fabulous organic gemstone is black fossil coral from indonesia.the oldest coral fossils are over 500 million years old. The earliest forms were different from those we see today and they died out 225 million years ago. Modern corals are still common in tropical oceans. These are solitary corals from the jurassic and cretaceous periods.fossil corals are ancient sea creatures that lived in colonies, and secreted a hard tube like skeletons. The individual tubes in which they lived are still quite apparent in the black and white pattern of this stone. Fascinating to be able to see what these once living colonies left for us to find, millions of years later!this particular fossil coral has a graceful designer shape and smooth glassy polish both front and backall henryka jewellery comes complete with a beautiful presentation gift box.stone natural indonesian black fossil coral material 925 solid silverapprox stone size 40mm x 18mmring size adjustable beautiful gemstones designed by naturethe henryka designer gemstones collection is a celebration of completely natural and beautifully rare gemstones from across the world.each gemstone is carefully hand chosen by us for its natural and un treated colours and patterns. We look for vibrant gemstones we know you will love, as well as rare gemstones you may have never even heard of from all corners of the earth.instead of seeking perfection, we choose gemstones based on the natural quirks and inclusions that make them entirely unique. This means incredible stripes, bold spots, wave like ripples and swirls that give each gemstone its own unique fingerprint.these characterful gemstones are then cut, polished and set by hand into silver jewellery designs, from statement necklaces to rings, earrings and bracelets. When wearing a piece of henryka designer gemstone jewellery, you can be assured that no one will ever be wearing the same piece. It is individual to you.