Sometimes a necklace's beauty elevates it to being an exquisitely-crafted work of art. Few colors can surpass the rich blue of sapphire, one of the world's most beautiful and treasured gemstones. Marquise sapphires cascade down a diamond-studded 10k gold petite necklace, flowing along the y-shaped lines to a drop-hung pear sapphire at the center. The necklace hangs on an 16. 0-inch chain with a spring-ring clasp. As september's birthstone, sapphire makes this necklace the perfect birthday gift.