Gold signet ring with diamondMaterial: GoldKarat: 9K Stone: Diamond Stone Colour: WhiteStone carat 2,5 x 0,05ct Stone type: TW.VSStone shape: old eurpean cut Available sizes: 50,52Does the piece come with a certificate? NoRingband: Most narrow at 1.3mm. Widest at 10.5mm. Highest at 3.4mm