Every stone has a natural relation to humans. Here's a broad classification. It is important to know that it differs from person to person.Aries: EmeraldPieces: DiamondLeo: Blue SapphireGemini: CoralAquarius: RubyCapricorn: RubyVirgo: RubyCancer: RubyScorpio: EmeraldSagittarius: DiamondTaurus: Yellow SapphireLibra: Yellow SapphireEMERALD: Skin, lungs, business, reasoning powersYELLOW SAPPHIRE: Memory, gynaecological disorders, weight, justice, rage, diabetes RUBY: Heart, bones, blood count, gynaecological disorders, skinBLUE SAPPHIRE: Nervous system, uterine trouble, arthritisDIAMOND: Water content and retention, beauty, blood count, moneyCORAL: Energy, epilepsy, calcium in the body, menstrual disordersPEARL: Mental abilities, rage, positive thinking, insomnia, attention span, blood pressure, excitability