The birthstones for each month are garnet for January, amethyst for February, aquamarine for March, diamond for April, emerald for May, pearl for June, ruby for July, peridot for August, sapphire for September, opal for October, citrine for November and blue topaz for December. The colors for some stones vary.
A garnet is a red stone that can range in color from a bright red to a browner shade of red to a very orange shade. Amethyst is always a purple stone, but the cut and clarity can shift the color from lavender to violet. Aquamarine sports a sky blue stone. Diamonds are usually clear stones, though there are artificial diamonds in a rainbow of colors. Emeralds are usually a vivid green color, although their colors can range from very light to very dark. Pearls are opaque white round stones. Rubies are bright red stones that are a little lighter than garnets. Peridots are lime green stones with a more yellow coloration than emeralds, while a sapphire is a dark blue stone. Opals are white stones with pearlescent blue and green flecks. Citrine is a pale amber stone, and a blue topaz boasts a medium blue color between sapphire and aquamarine in color.