Each of the signs of the zodiac are said to rule a particular gemstone. Wearing the particular stone of your sign is intended to focus the energies of the sign through the gem, enabling their expression in your daily life. The energy of the sign is channelled through the planet (usually the Sun) placed therein; this is expressed and focused through the corresponding gem. Yet no stone is wholly composed of the energies of one single sign, or planet (no stone is pure Aries, nor pure Mars, for example). Each natural material, each crystalline structure comprises a blend of correspondences. We should also bear in mind that the planets may not readily express the energies of the signs, if poorly placed or aspected. Wearing a birthstone can bring great difficulties into our lives, should this be the case. The acceleration of karma brings the potential for increased consciousness, but at the risk of considerable hardship.

Every gemstone has its own unique properties: colour, crystalline structure, hardness and so on. Each stone has its own unique character and abilities too. Some stones are healers; others are aids to concentration; some are warriors; some are good for business. You need to get to know and understand your friend from the mineral kingdom. Match the stone wisely with the radiance of your horoscope; only then can you experience prosperity, happiness, growth and other benefits.

The idea of a birthstone connected with the month of your birth is based in astrological correspondence. However, our calendar has been revised and the months no longer correspond exactly with the signs. Hence some confusion has arisen. This table shows some widely-accepted modern, traditional and mystical rulerships for each sign, but in truth each sign rules many stones.