In your listing you state:

Winner would be charged for Paypal charges due to high fees from final sale and listing postage would be standard Australian post (insurance by choice of Bayer)

I dont think you are actually allowed to do that.

Also, you sold $1800 worth of gold jewellery and you posted it by regular post!

Are you for real?

You'll be lucky if the item actually arrives. I can smell a paypal claim for item not received happening here.