Elegant sterling silver genuine blue topaz and diamond necklace on 18" sterling silver chain. A single blue topaz gemstone dangles freely inside this beautiful open heart pendant. If you are looking for a classy, affordable diamond necklace (0.01 ct, I-J color, I2-I3 clarity) this is definitely a winner. As far as size, the heart pendant is approximately 24mm x 18mm. 8-SSDN-TN8124BTD