gemstone according to birth chart Well we always listen that it is very difficult to predict anything. Similar is in the case of gemstones, it is quite complex to predict gemstones for a person based on the astrology. Let me tell you some of the factors that actually depends on the selection of gemstone. It is very important that the astrologer who is predicting your astrology is experienced and has good knowledge of Vedic astrology. Secondly, gemstones can be predicted depending on your sun sign. Like if you belongs to Cancer, then Ruby gemstone is best for you. Apart from this, gemstones are also predicted by astrologers after analyzing your birth chart. If you have some particular problem like child, marriage or any health issues, the your astrologer will recommend you stone depending on your horoscope.