13.75 carats total weight Round Shape London Blue TopazMulti-Gemstone Necklace in Sterling Silver Stones: Genuine London Blue Topaz: 47 pieces, Round Shape 4.00mm 13.75 carats total weight Gemstones have a deep rich color and tremendous fire. Necklace: 10.15 grams Pure Sterling Silver with .925 stamp Wheat Style 16 to 18 inch adjustable length, 3 3/4 width Approximate Retail Value: $179.99 Necklace features a one of a kind design with a beautiful White Gold finish.