Blue Madagascar Natural Sapphire Gemstone Necklace. Over 150 gemstones. This is a great dainty and feminine necklace. Unique and rare earthy blue color. The gems are 3.to 3.5mm in size. The necklace length is 18-19". The chain and clasp are 14k gold filled. Beautiful sapphire sparkle. This color works with almost any outfit. Wear alone, jumble with other necklaces or add a pendant.