Thank you for submitting your items for appraisal. The ring is in white metal with a central purple stone. This item seems in solid sterling silver (925). The stone is an oval shaped amethyst in cabochon cut. Observing the photos the stone could weight about 8ct. Its color is medium-intense and it could be considered A quality. 
According to the pictures the ring is modern and handmade. It could be suitable also for men's since its size is 9US.
Feel free to contact us if you have further questions. Thanks