Which gem should I wear?

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Which gemstone should I wear?  How do you determine what is best for me?  Many Vedic Astrologers will recommend gemstones to a client as part of their natal reading.
The method by which the gems are chosen is part technical, knowing Vedic Astrology, and also partly intuitive.  The methods vary by astrologer and many times clients, having received sometimes contradictory advice, call me confused and wondering what to do!
The purpose of this blog is to discuss the various methods by which gemstones are reccommeded, and to discuss the pros and cons of each method.