This is an authentic ring from David Yurman, it is crafted from solid 18k yellow gold with a high polished finish and features an octagon shape flat top with a blue green agate stone and a soldier carved intaglio. It is fully signed by the designer with the metal content. Material: solid 18k yellow gold Hallmark: DY 750 Measurement: 16mm x 16mm x 4mm high Ring Size: 10.5 Weight: 18.6 grams