Rhodium plated sterling silver rainbow necklace is 16 inches with a 2-inch extension. The curved bar measures 37.14mm and features 11 square cubic zirconia stones that measure 3mm each. ABOUT CUBIC ZIRCONIA: Cubic zirconium, commonly known as zirconia or CZ, is a lab-created stone that mimics diamonds and fine gemstones. It was first created in 1977 and now is made in many different colors. CZ has a high degree of "fire" meaning the prisms of light and color that reflect from the stone. The synthesized material is hard, flawless and bears great resemblance to a perfect diamond. Due to its low cost and great durability, CZ’s are often used with fine metals to emulate diamond and gemstone jewelry. This alternative gives an expensive look at a more affordable price! ABOUT RHODIUM FINISH: A rhodium finish is plated over other metals to make it non-tarnish, and is a hard-wearing, scratch resistant metal - the same metal used to plate white gold! Rhodium is more expensive per ounce than gold, platinum, or palladium!