10MM Yooperlite Stones and Stainless Steel Toggle Clasp.  ‘Yooperlite’, in short, is a special kind of fluorescent rock that you can find predominantly along the shores of Lake Superior that, as the trademarked name suggests, can glow when subjected to specific lighting conditions (black light).  The yooperlite is a stone of truth and allowing to recognize and express objectively his/her feelings. Yooperlite releases anger and negative thoughts and helps fight your fears and phobias. It creates a clear and perceptive mind, able to find inner peace. Yooperlite stimulates self-acceptance and self-confidence.