blue sapphire or neelam

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When should one wear a Blue Sapphire or Neelam? whats the way to determine the size of the stone? what are the factors to be kept in mind while purchasing it ?

of the various metals that you can get the stone in .. like the

asthdhatu, gold, or silver should one see the planetary configuration

and decide or is it done based on what you like? can one get a setting with or without other stones in the same ring.