Super Sparkling Machine Cut Cubic Zirconia, Brushed Finish, Comfort fit, 5mm width, Size 8 to 13, Heavy Duty Cobalt Construction, Hypoallergenic and Durable. Cobalt rings are a perfect alternative to Platinum rings. Not only are Cobalt Rings fraction of a cost of Platinum rings, but Cobalt is four times harder then Platinum which makes it durable and scratch resistant. Includes Designer Gift Box and Free Shipping. Style SR10650 Brand: Oravo Design: Gemstone Style: Bands & Sets Occasion: Christmas & Hanukkah Resizable: No Adjustable: No Size/Dimensions: 9 Gift Box: Gift Box