Karen Walker Silver Micro Acorn and Leaf Studs with Tigers EyeMicro Acorn and Leaf Studs Silver Divinely detailed, the elegant Micro Acorn and Leaf Studs are a precious piece of fairytale forest destined for your ear. A duo of organic in design mini acorns have been plucked from a great oak tree. Suspended from a dainty branch, roughcast true to a leafy twig in sterling silver and 9 carat yellow or rose gold, these petite acorns have budded a tigers eye nut; a semi precious stone favoured for bringing good luck.