For Purpose of astrological gems the most important criteria are as follows:

1. It should be of the right caret as prescribed by the astrologer like the doctor’s specification of the medicine--if he subscribes 500mg, it must be the same.

2. It must be a natural stone. A natural stone comes with impurities and clouds. They are responsible for the right colour of the prescribed gem.

3. There should not be any cracks. But one must not confuse cracks with impurities and clouds.

4. Some gemstones are thermally treated or laser treated which gives its luster and shape.

5. The ring must be manufactured as per astrological specification that may not be the most stylish design. The astrological specification ensures proper transmission of light through the gemstone into our body.

6. The ring must be worn on the right finger specified.

Colour

Clarity

Cut

Carat

Conclusion
This guide is intended to help you understand the factors that go into grading gemstones. You have learned that the term "quality" has to do with the rarity of a feature, not that it is necessarily better than something else. Nature does not provide us with perfect gems but the final and most important factor is the joy you get from your gem.

We in Cyber Astro will ensure the best value for money and also astrologically the most effective gem store within your budget

• Ruby

• Emerald

• Blue Sapphire

• Yellow Sapphire

• White Sapphire

• Hessonite

• Chrysoberyl (cat’s eye)

• Pearls

• Tourmaline

• Beryls

• Citrine

• Amethyst

• Opals

Gemstones are not only beautiful, but also very valuable, there are innumerable synthetics and imitations. So how can we protect our self from these 'fakes'? Well, the best way is to buy from a specialist in whom one has confidence. Large emeralds in particular should only be purchased with a report from a reputable gemological institute. Such an institute will be able, thanks to the most modern examination techniques, to differentiate reliably between natural and synthetic gemstones and will inform us as to whether the stone has undergone any treatment of the kind a purchaser has the right to know about.

Extracted from:
http://www.gemstone.org/gem-by-gem/english/ruby.html
http://www.gemsociety.org/info/igem20.htm

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