Jewelry Design Bow Tie Sandstone Fashion Accessory by Yakobium S.r.o Using their own process, the Yakobium designers were able to transform sandstone to this very unique accessory piece. The Yakobium Bow Tie is robust but lightweight and can easily be worn to any occasion. Shape, color, size as the rest of the item can be customized. The sandstone bow tie is complemented by handmade packaging.