Birthstones

month traditional gemstone 20th-century expansion synthetic supplement: trade name material of synthetic stone

January garnet garnet dark red synthetic corundum

February amethyst amethyst purple synthetic corundum

March bloodstone aquamarine aquamarine light blue synthetic spinel

April diamond white sapphire colourless synthetic spinel or corundum

May emerald emerald synthetic emerald or synthetic green spinel

June pearl alexandrite cultured pearl, alexandrite changeable synthetic corundum (synthetic spinel is rare)

July ruby ruby red synthetic corundum

August sardonyx peridot peridot green synthetic spinel

September sapphire sapphire blue synthetic spinel or corundum

October opal tourmaline (pink or green) rozircon pink synthetic corundum or spinel

November topaz (precious) topaz quartz (citrine) topaz yellow synthetic corundum

December turquoise zircon zircon medium blue synthetic spinel