Ray-Ban RB4253 Blue Gradient Round Sunglasses Tortoise with Blue Tint. In excellent condition Ray-Ban RB4253 Blue Gradient Round Sunglasses Tortoise with Blue Tint. Features round plastic brown tortoise frames, blue gradient lenses, gold metal arms, black leather Ray-Ban sunglass case included, discontinued style. Authentic Ray-Ban sunglasses, etched RB left lense by hinge, double screw hinges, Ray-Ban on plastic nose pieces. This is a pre-owned item that may show signs of wear. In excellent condition.