| Month |
Traditional gem stone |
Traditional
color |
Traditional
description |
Modern gem stone |
Synthetic
trade name |
| January |
Garnet |
Deep
Red |
silicate
mineral, generally crystallized |
Garnet |
Garnet |
| February |
Amethyst |
Purple |
purple
or violet variety of quartz |
Amethyst |
Amethyst |
| March |
Bloodstone |
Dark
green |
green
variety of quartz, spotted with red jasper |
Aquamarine |
Aquamarine |
| April |
Diamond |
White |
Nearly
pure carbon in crystalline form |
Diamond |
White sapphire |
| May |
Emerald |
Green |
green
variety of beryl |
Emerald |
Emerald |
| June |
Pearl |
White/bluish
gray |
smooth,
hard usually roundish, from oyster |
Alexandrite |
Cultured pearl, Alexandrite |
| July |
Ruby |
Red |
Deep
red variety of corundum |
Ruby |
Ruby |
| August |
Sardonyx |
Brownish
red & white |
Variety
of onyx with layers of sard & chalcedony |
Peridot |
Peridot |
| September |
Sapphire |
Deep
Blue |
Pure
form of corundum |
Sapphire |
Sapphire |
| October |
Opal |
variety
of colors |
generally
Milky translucent silica refracting light in a variety of colors |
Tourmaline Opal |
Rozircon |
| November |
Topaz (precious) |
Yellow
variety |
Aluminum
silicate mineral; colors vary |
Topaz quartz |
Topaz |
| December |
Turquoise |
Greenish
blue |
Hydrous
phosphate of aluminum with small amount of copper |
Zircon |
Zircon |