This vintage authentic tapered dome shape ring is by Cartier. It is crafted from 18k yellow and white gold featuring half part white gold and the other half yllow gold with fine grooved lines in a fancy design at the front half of the band. The tapered back of the band is polished and has full designer hallmark with the serial number, ring size and gold content.Hallmark: Cartier 750 55 106242Material: 18k white and yellow goldMeasurement: front of band: 0.89" across x 0.20" wide x 0.16" highRing Size: 7.25Weight: 3.9 grams