Cooksons used to do these ring blanks in 18ct White and Platinum, now they seem to be discontinued in all but silver. I was wanting to use them to expand onto a couple of 18ct halo rings, to protect and preserve them but now they're gone, boo-hoo. I guess I'll just have to get heavy flat ones and file them out, but how wasteful is that!

Has anyone seen them elsewhere?

Cheers!

Nikki