Associated Gemological Services, LLC   Home > Gemstones Precious gemstones Alexandrite Amethyst Aquamarine Citrine Diamond Emerald Garnet Iolite Opal Pearl Peridot Ruby Sapphire Sapphire - Blue Star Tanzanite Topaz Tourmaline Turquoise Zircon Birthstones by month January : Garnet February : Amethyst March : Aquamarine April : Diamond May : Emerald June : Pearl June : Alexandrite July : Ruby August : Peridot September : Sapphire October : Opal October : Tourmaline November : Topaz December : Turquoise December : Blue Zircon About synthetics & gemstones enhancements Appraisals Qualifications Diamonds Jewelry Emeralds 4C's Gemstones Links Services GuestBook About Us Site Map Contact Us Home