Ross-Simons - .75 Carat Bezel-Set Diamond Necklace in 14kt Yellow Gold. 18". Ideal for your everyday signature necklace, this glittery .75 carat diamond solitaire shines from a sleek bezel setting of polished 14kt yellow gold. Suspends from a box chain with a springring clasp. Bezel-set diamond necklace. Diamond birthstones are the perfect gift for April birthdays.