Our artisan free dives into the waters off of his native Scottish Highlands and the West Coast Islands to find each exquisite Scottish marble stone, and then hand-sets it beside peridot into .925 sterling silver. Beginning as a limestone formation underneath the ocean over 800 million years ago, Scottish marble receives its yellow-green color from the chlorophyll of plants and algae which sank in the sea and settled atop it. Handcrafted exclusively for Uno Alla Volta, from the heart and hands of the artisan. Dimensions - 1 inch long, adjustable.