January

Garnet

Alternatives: Emerald, Rose Quartz

February

Amethyst  

Alternatives: Bloodstone, Moonstone, Onyx

March

Aquamarine

 Alternatives: Rock Crystal, Bloodstone, Jade

April

Diamond

Alternatives: Quartz, White Sapphire

May

Emerald

Alternatives: Sapphire, Agate, Chrysophase, Beryl

June

Pearl 

Alternatives: Moonstone, Alexandrite, Opal

July

Ruby

Alternatives: Carnelian

August

Peridot

Alternatives: Sardonyx, Diamond, Sapphire, Jade

September

Sapphire

Alternatives: Agate, Moonstone, Lapis Lazuli, Diamond, Chrysolite

October 

Opal  

Alternatives: Tourmaline, Jasper, Opal, Zircon, Aquamarine

November

Topaz

Alternatives: Citrine, Pearl, Diamond

December

Turquoise

Alternatives: Blue Topaz, Zircon, Lapis Lazuli, Onyx, Ruby