This 14k yellow gold ring features a stunning blue sapphire as the main stone, accented with four natural diamonds. Sapphire is considered a precious stone because of its high rating (9) on the mohs scale of gem hardness. While diamonds are the hardest gems at a mohs rating of 10, sapphires are related at 9 making them extremely scratch resistant. These marquise-shaped sapphires and diamonds sparkle beautifully in a solid 14 K gold vintage setting style with prongs. Size 6.