Cobalt Treasure 18" Necklace Your own one of a kind custom Cobalt Treasure necklace features cobalt blue marbelized hand blown glass 4 cm teardrop pendant and 1 1/2 cm round beads all fumed with 24 Karat Gold. Color accents of cobalt blue Swarovski crystal beads, bronze washed tulips on a gold plated chain with a barrel closure complete this elegant design.