Help to date, describe and size large, vintage rhinestone ring

Here is the ring, which measures exactly 1" L. It looks like brass to my eye, does that sound right? And it would be called pierced, right?

Here it is from the side.

It's marked SETA© inside the band. The maker? (Sorry for the lousy shot. I tried and tried...)

Finally the size. It seems to read 9 3/4, not quite 10. So what size do I actually call it?

As ever, my thanks.

 

I found this same ring, in sold listings on eBay. So I think I'm ready to list it. But I still have that question about what size to call, being closer to 10 than 9...

 

It's Art Deco styling, though it may have been made in a later period.

 

Thanks!

 

This I can help with! Call it 9.75. That's what I look for, as I wear a 6.75.

 

Many thanks, silver!