Nothing wrong with 5ct stones Charlie, my largest good 1 from Inverell is only 6ct, but there are lot's of stones around 2-3ct, heaps. There are big ones there but same as any day fossicking, just gotta be lucky. I spoke to a bloke there last time who got a 22ct Cornflower Blue and a few others not much smaller, he was a local though and heads there regularly.
Another bloke got a 15ct stone from the creek bank when we were there too.
I'll keep heading back there every month or 2, gotta crack a big one sooner or later there.