Material: Pt900 K18 Combination Product Name: Diamond-studded Pt900 K18 Design Ring Gemstone: Diamond The size is not officially known as I don't have anything to measure with. I estimate it to be around size 12... This is a personal item, so it has not been polished. I will carefully polish it with a cloth and package it. Engraving: Platinum 900 K18 2.13 The weight was measured with a household scale. It fluctuates between 11.0 and 11.5 grams, so it's likely somewhere in between. Please understand that returns are not accepted. Please only purchase if you understand and agree to these terms.