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It is about 6.5 x 5 centimetres and semi transparent. It has quite a tough skin and is hollow inside. Like a tight clear tooth shaped balloon. I have put a coin next to it for you to see the size.

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    $\begingroup$ Dentist merchandise? $\endgroup$ – user1721135 Jan 5 '18 at 22:47
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It's a swim bladder, probably a porcupinefish swim bladder. They can be found washed ashore still inflated. They've been described as "molar shaped". (Picture from Australian Museum.)

enter image description here

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It's hard to tell exactly, but if I had to bet I'd say it's a small part of an algae called Neptune's necklace:

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Some species are native to New Zealand and Australia. Where two "branches" split, the shape you found can be produced.

Looks like they're also found in your area: http://bie.ala.org.au/species/NZOR-4-7414

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