Lady's 18K White Gold 1.65ct Sapphire & Diamond Ring. Contains: One (1) Natural 1.65ct Oval-Cut Sapphire. Color: Blue Transparent - Good. Clarity: Moderately Included Thirty-Four (34) Natural Straight Baguette-Cut Diamonds. Color: Near Colorless. Clarity: VS/SI Weight: 2.12cttw Ring Size: 5 1/4 (Can easily be resized - up or down - to fit any finger). This natural sapphire's color is about as good as it gets. It is in a custom, hand-made 18K White Gold & Baguette Diamond mounting. Chairman's Comment: Traditionally, at least 18K Gold has always been the minimum Karat weight for fine jewelry. In Europe, they almost consider anything less than 18K unacceptable. Besides the "18K" stamp, sometimes it will be stamped European style with "750" and of course, platinum is still considered the "Noble Metal."