This is an authentic Rolex GMT Master II 16713 40mm serti ruby diamond dial watch with black rotatable 18K yellow gold bezel, and 18K yellow gold stainless steel oyster bracelet, and Rolex warranty card. Descriptions: Brand: Rolex Model: GMT Master II Reference: 16713 Serial Number: K Serial Gender: Men's Case Diameter: 40mm Features: Dial: Serti Ruby Diamond Dial Bezel: Rotatable 18K Yellow Gold Black Bezel Crystal: Sapphire Crystal Case: Stainless Steel Case Movement: Certified Chronometer Self-Winding Automatic 3185 Movement. Bracelet: 18K Yellow Gold and Stainless Steel Oyster Bracelet Wrist Size: Fits Wrist up to 7.5 in. Box: Watch Box Paper: Rolex Warranty Card.