Mercury is Gemini's planetary ruler, and the planet Mercury is depicted here.

Mercury, the messenger of the gods, is the ruler of both Gemini and Virgo. It is the planet of day-to-day expression and communication. Mercury's action is to take things apart and put them back together again. It is an opportunistic planet, decidedly unemotional and curious. Mercury analyzes, sorts, groups, and makes sense of things -- and so does Gemini!

Gemini's glyph is shown here.

The glyph for Gemini depicts two lines joined together, showing the symbolism of the twins, and the duality of the nature of the sign.

Flowers associated with Gemini are the lily of the valley (which represents love, happiness, and humility, depicted here) and lavender (which represents refinement and elegance).

Gemini's element is AIR. There are three Air signs: Gemini, Libra, and Aquarius. Air signs are intellectual, detached, and fair-minded.

While Air signs share the same element of Air, they each have a different modality: Gemini is Mutable Air, Libra is Cardinal Air, and Aquarius is Fixed Air. Gemini is considered the most adaptable of the Air signs. Gemini takes an intellectual or mental approach to life.

The symbol for Gemini is the Twins.

Geminis are said to have a dual nature, as symbolized by twins. This duality also represents exchange and interaction. The sign of Gemini is closely associated with the exchange of ideas, communication, and trade.

The sign of Gemini is thought to be very adaptable and flexible, sometimes to the point of "being" two different personalities.

Gemini belongs to the Mutable Modality. There are four signs, including Gemini, in the Mutable group: Gemini, Virgo, Sagittarius, and Pisces. Each of these signs is of a different element but share the same mode.

Mutable signs are flexible, adaptable, and changeable. Although they can be inconsistent and lack follow-through, they are ready to make small changes and adjustments to accommodate others.

It can be said that Gemini is a Mutable Air sign, where Mutable is its mode and Air is its element.

The glyph of Gemini's ruling planet, Mercury, is depicted here.

Mercury's glyph, or symbol, resembles that of Venus, with the addition of a semi-circle (hat) at the top. Spirit (circle) over matter (cross), resulting in receptivity (crescent). This suggests the evaluation of the senses through rational thought.

The constellation of Gemini is depicted here.

The metal associated with Gemini is quicksilver.

Gemstones associated with Gemini are the agate (representing strength and said to help reduce stress, dizziness, and headaches, particularly useful for the often mentally stimulated Gemini sign) and emerald (representing love, depicted here).

The color most associated with Gemini is yellow, connected with optimism, cheerfulness, friendliness, lightheartedness, and freshness.

Gemini is the third sign of the zodiac and is also associated with the third house.

The third house rules the mind, communication, interactions in our immediate environment, siblings and early environment, neighbors, thoughts, short trips, writing and speaking, our practical thinking, how we classify and examine information, our need to hear news (and/or gossip) and for spreading news, mental dexterity, lungs, airways, hands, letters, emails, documents, telephones, the neighborhood, everyday mental chores and mental activities, means of transportation, getting from point A to point B, speech, and more.