I can read auras, at least I'm learning to.
Depending on the colour, this is what it could mean:
ORANGE AURA COLOR: Relates to reproductive organs and emotions. The color of vitality, vigor, good health and excitement. Lots of energy and stamina, creative, productive, adventurous, courageous, outgoing social nature; currently experiencing stress related to apetites and addictions;
Orange-Yellow: Creative, intelligent, detail oriented, perfectionist, scientific.
YELLOW AURA COLOR: Relates to the spleen and life energy. It is the color of awakening, inspiration, intelligence and action shared, creative, playful, optimistic, easy-going.
Light or pale yellow: Emerging psychic and spiritual awareness; optimism and hopefulness; positive excitement about new ideas.
Bright lemon-yellow: Struggling to maintain power and control in a personal or business relationship; fear of losing control, prestige, respect, and/or power.
Clear gold metallic, shiny and bright: Spiritual energy and power activated and awakened; an inspired person.
Dark brownish yellow or gold: A student, or one who is straining at studying; overly analitical to the point of feeling fatigued or stressed; trying to make up for "lost time" by learning everything all at once.
VIOLET AURA COLOR: Relates to crown, pineal gland and nervous system. The most sensitive and wisest of colors. This is the intuitive color in the aura, and reveals psychic power of attunement with self. Intuitive, visionary, futuristic, idealistic, artistic, magical.
LAVENDER AURA COLOR: Imagination, visionary, daydreamer, etheric.
Many times an aura is not a single colour or shade, that must be taken into account when reading! Also the colour of one's aura will not be constant, it will change depending on their energy.