12-inch strand - 10 carats. 16-inch strand - 15 carats. Quality: aaa+ grade high quality. Brown diamonds: brown diamonds (sometimes called chocolate diamonds) are said to symbolize stability, practicality, and dependability.They range in hue from light (cognac) to darker hues (champagne). Brown diamonds have a subtle but unique beauty and are ideal for down-to-earth, practical, and good-natured folks. This item is made of gemstone.