I found these beautiful holey stones on Woodside beach, the starting point of Ninety Mile Beach in Victoria. 

 

'Aholey stone, also known as a hag stone, which is a stone with a natural (not a human-made) hole through it. Holey stones have long been carried as charms. The holes are considered doorways or portals through which someone can draw or repel energy. For example, the holey stone can bring luck or send away misfortune, bring wealth or banish deprivation, and so on. Many people look at the Moon through the holey stone in order to charge it with lunar power. Many cultures use holey stones for divination. To divine with a holey stone, the holder of the stone peers through the hole to see visions and gain wisdom.

Some fossils, such as the sand dollar, also have natural holes in them and assume the same magical qualities as a holey stone. Sand dollars have special meaning because they are natural pentacles.'  ~ from magic for Dummies