Heera or diamond is the ultimate gemstone, and has few weaknesses and many strengths. It is well known that Diamond is the hardest substance found in nature, but few people realize that Diamond is four times harder than the next hardest natural mineral, corundum (sapphire and ruby). But although as hard as it is, it is not impervious to force. Diamond has four directions of cleavage, meaning that if it receives a sharp blow in one of these directions it will cleave, or split. Askilled diamond setter and/or jeweler will prevent any of these directions from being in a position to be struck while mounted in a jewelry piece. It is basically an allotrope of carbon and has the same chemical composition as graphite. Diamond represents Venus, who is a planet of beauty and grace. Diamond therefore signifies beauty, grace and sophistication. It represents sexual happiness and is the prime significator of male semen. It is for this reason that people suffering from a weak libido and sperm related issue benefit greatly by wearing a diamond ring. People with Libra ascendant benefit most from a diamond. Those with Taurus ascendant should not wear it if Venus is placed in ascendant as it then tends to cause injury to head. Those with Libra falling in the second, fifth or the ninth house also benefit a great deal.