January is Garnet

February is Amethyst

March is Aquamarine

April is Diamond

May is Emerald

June is Alexandrite - Agate - Moonstone

July is Ruby

August is Peridot - Onyx

September is Sapphire - Carnelian

October is Opal - Pink Tourmaline

November is Topaz - Citrine

December is Zircon - Tanzanite