This is a 10K Heart Shaped Gold Pendant / Drop with a Red Stone. The Red stone is approximately 5 & 1/2 Millimeters in size. It measures 3/8" by 1/2". The Gold is marked and is 10K on the back. It is a very beautiful drop and is heart shaped with Gold Nuggets in a Heart shape, running around the border. The Red Stone looks very much like a Garnet.