Aquamarine and diamond necklace

centered a claw-set oval-cut aquamarine weighing approximately 4.55 ct, surrounded by pavé-set round brilliant-cut diamonds weighing approximately 0.80 ct, a decorative bail with tube and pavé-set round brilliant-cut diamonds, on an anchor chain detailed with four tube-set round brilliant-cut diamonds, 18k white gold, length approximately 40cm, total weight 7.30 grams