Yes, it is stamped 10k on the inside of the band. The ring is slightly out of round, but can easily be reshaped by a jeweler free of charge. Yellow gold is much softer than white gold, sterling silver or stainless steel.
I took a lot more pictures, very close up in response to a request. However, Listia will not let me add them now:( They say it is too close to the end of this auction. I think that is just STUPID and I am sorry that I can't prove to you just how nice this ring really is!