18K Gold Emerald Cut White Sapphire Ring This is a 18k gold overlaid 925 silver White Sapphire simulated diamond. Lab grown diamonds are sometimes referred to as simulated. man-made. synthetic cultured or artisan, each phrase phrase denotes a certified diamond that has been grown in a lab. my other listing:I offer an extensive array of beautiful earrings, necklaces, pendants, and rings for you as well as to make an ideal gift for all occasions. I have Exquisite Lab diamond engagement rings and wedding bands perfect for the special moment. With a vast collection of white, black, blue, champagne and yellow stones, you can be assured to find what you are looking for.