White seaglass. Actually while another pinner has claimed this as white it actually isn't. It was most properly clear glass but after much tumbling in the seas it has become frosted, giving it the look of white.
How to Drill Pebbles and small beach or garden stones by Eternal Tools. This follow along tutorial is full of tips and makes drilling holes into pebbles nice and easy. It shows the equipment you'll need, top tips along the way and some inspiring work by other artists who use pebbles and stones in their jewellery and craft work.