Marble stones are ideal to make some jewelry as they are original and you won’t need to think how to frame them brightly. To make ones you’ll need black and white polymer clay, a gem mold and an oven. Warm a ball of white polymer clay, then slowly add tiny chunks of black clay. Work the clay together rolling into a ball and stretching out again, add more black flecks until you’re happy with the results. Pull off sections of clay and firmly pack them into your mold. Pop into the freezer for half an hour to set. Once hard carefully remove the solid stones from the mold and bake on a low heat for half an hour. You can read how to make jewelry of these stones here.