The stone is 10mm x 7mm & ring weighs 2.8 grams. Clearly marked inside the band 10k. It has been acid tested and verified at least 10k.  I will say Id like for you to understand here lately ebays authenticity program has been quite picky as they use an XRF testing machine which I cannot afford. It is possible that they come back and say this is 9 carat gold as this has happened to me. Please buy with the expectation of this in case it does occur. I try my absolute best to guarantee what I sell however I simply cannot at this time afford an XRF machine. So we use acid and this one holds strong with 10kt acid. Please see photos for details of the exact item you're buying. As always, if you have any questions just ask!