Gold-filled or sterling silver small hand-stamped disc with initial (please indicated letter in comments) with semi-precious birthstone. Let us know which single letter initial you'd like, birthstone choice then Choose Gold 16", gold 18", silver 16", silver 18" chain.
 
January - Garnet
February - Amethyst
March - Aquamarine
April - Diamond (crystal)
May - Emerald
June - Pearl
July - Ruby
August - Peridot
September - Sapphire
October - Pink Opal
November - Citrine
December - Blue Topaz
 
You  may also add a small cross to the necklace for an additional $4.