Please note: Our image is an example of the crystal you have selected and ordered. You will receive a crystal of equal quality and size to the representation. For those crystals with significant colour variation, please send me a message as to any particular colour preference so that I can try and fulfil your request personally.
Slightly small than the size of a 10 cent piece. 
Aura Cobalt 
Source: Manufactured
Chakra: Throat
Zodiac: Sagittarius
General: Cobalt Aura is one of the generations of New Age crystals, created from natural minerals using the best of modern techniques, to join the old and new worlds in harmony.  They contain natural minerals and elements, and so can be used for healing as well as empowerment and protection.  They gain powers the separate components do not possess.  Cobalt Aura increases natural clairvoyance and healing powers. A cluster held regularly will ease the transition between personal spiritual work and formal training or turning professional.  Aids creative cooking.
Beneficial For: Claimed to be beneficial for – Combining the body’s own self-healing powers with higher healing.  To help if illness is unresponsive to treatment or a patient is exhausted by prolonged medical intervention, absorption of vitamins and minerals, functioning of enzymes, kidneys, pancreas, liver, spleen, and processing of glucose.
Emotional Healing: Claimed that even a small piece of Cobalt Aura opens doors and both calms and inspires agoraphobics.
Practical Uses: Makes every day seem special.  Even in a small cluster in the home removes restlessness and discontentment.
Workplace: Cobalt Aura removes the constraints that may hold us back from expressing ourselves through work.2
References:
Cassandra Eason, “The Complete Crystal Handbook”, Sterling Publishing, New York, 2010