add a stone with sterling silver wire...
Choose Birthstone (shown in order):
January/ Garnet
February/ Amethyst
March/ Aquamarine
April/ white Topaz or Quartz crystal
May/ Emerald
June/ Freshwater Pearl
July/ Ruby
August/ Peridot
September/ Sapphire
October/ Pink Tourmaline
November/ Citrine
December/ Blue Topaz or Turquoise
Other stones (these are not shown):
Moonstone
Mother of Pearl