18k yellow gold necklace with slide-in clasp and safety catch, set with round cut blue sapphires, aprpx. from 2, 2.5, 3 mm to 3.5 mm and marquise cut blue sapphires, apprx. from 4.5 x 2 mm to 5.5 x 2.8 mm, and accented with round brilliant cut diamonds, total estimated diamond weight 0.40 ct, SI-I1 clarity, G/H color; marked on the clasp; overall weight 31.1 gm.