The gems on the earrings and necklace are all the same size – 12.6mm by 16mm. They are rhodium plated (silver). The earwires are sterling silver. The chain is also sterling silver. The loops on the chain are 1.4mm wide by 2.0mm long.The necklace measures approximately 16.5 inches (the chain measures approximately 16 inches with .5 inches for the clasp/jumprings).