Looks about a carat to me. I wear a 6.5 and have a not-so-lovely .75 that my ex gave me. It doesnt look
that big on my finger so I say more towards the .9 to carat range.
I think it could be 1ct, as I wear 6.5 and have a very well cut 0.95ct stone that I think looks a tiny bit smaller, although it''s hard to compare to the photo. Anyway, I believe it''s in the 0.90-1.00ct range.