Diamond crusted crescent moons flank a robust moonstone center representing a full blue moon. The basic shape of these necklaces is the triple goddess symbol which compares the phases of a woman's life maiden, mother, crone to the cycles of the moon. Man has made many divisions of time to chart the year the Julian calendar, the Gregorian calendar....often these systems are based on the sun which with its daily rising and setting is a great way to chart the time of day however there are 13 lunar cycles in the year and only 12 months. The second full moon in a month is called the Blue Moon. Native Americans cultures like the Cherokee and Ojibwe still chart the progression of the year by the 13 lunar cycles.
