Fingernails scratch 2 to 2.5
Pennies scratch 3.0
Knife blades scratch 5.5
Window glass scratches 5.5
Steel files scratch 6.5
Garnet scratches 7 to 7.5
Carborundum scratches 9.5
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BIRTHSTONES
Modern Talesmanic
Genuine Synthetic Ancient
January Garnet Garnet Onyx
February Amethyst Amethyst Jasper
March Aquamarine Aquamarine Ruby
Bloodstone
April Diamond White-Spinel Topaz
May Emerald Tourmaline Carbuncle
Garnet
June Moonstone Alexandrite Emerald
Pearl
July Ruby Ruby Ruby
August Peridot Peridot Diamond
Sardonyx
September Sapphire Blue-Sapphire Jacinth
October Opal Rose-Sapphire Agate
Tourmaline Sapphire
November Topaz Golden-Sapphire Amethyst
December Tourquoise Blue-Zircon Sapphire
Lapis-Lazuli
