Gorgeous 14K Yellow Gold Blue Topaz Diamond Evil Eye Necklace. This unique piece features numerous single cut diamonds and one natural blue topaz in the center. The total weight of the diamonds is .08 carats and the topaz weighs .12 carats. The necklace measures 16 inches long and the pendant measures .50 of an inch wide by .25 of an inch long. It weighs 2 grams.