Certain gemstones are associated with particular months of the year and are considered lucky for people born in those months. Some attribute the origin of the tradition of birthstones to the twelve-jewelled breastplate, a vestment worn by Aaron, the brother of Moses.
Over time, myths and superstitions grew around these stones and symbolic meanings or virtues were eventually ascribed to them. The following zodiac gems are considered to be the most commonly accepted. The first record of wearing stones of the month was in Poland in the 18th century, when they were worn to keep illness away.
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| Aries – Bloodstone | Taurus – Rose Quartz | Gemini – Aventurine |
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| Cancer – Tiger Eye | Leo – Carnelian | Virgo – Red Jasper |
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| Libra – Lepidolite | Scorpio – Unakite | Sagittarius – Obsidian |
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| Capricorn – Malachite | Aquarius – Fluorite | Pisces – Amethyst |