looney about all things lunar? celebrate our favourite phase of the lunar cycle ' the crescent moon. this sterling silver cz crescent moon necklace is available in a range of lengths from 14-32 inches - just select your desired length from the drop down menu! the design itself measures 18mm high and 7mm wide. the moon design itself features 7 gemstones, each measuring 2mm, and it sits on a 1mm diamond cut curb chain, fastened with a spring ring clasp.