Lady's 18K Yellow Gold 3 Stone Round 1.04cttw Diamond Necklace. Contains: One Natural Round Cut Diamond weighing approx. 0.50ct. Color: G-H, Clarity: VS(1)/VS(2) Two Natural Round Cut Diamond weighing approx. 0.54cttw. Color: G-H, Clarity: VS(1)/VS(2) Necklace Length: 16 Inches. A beautiful and fine handmade 18K gold lady's three-stone diamond necklace originally purchased from Brown & Co. Jewelers. Brown & Co is an exceptional AGS jeweler located in Roswell, Georgia, known for carrying only the highest quality merchandise. Brown's written appraisal for this necklace was $5,055. At Capetown, we see things differently.