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七月诞生石:红宝石九月诞生石:蓝宝石红宝石和蓝宝石的矿物成分同属刚玉,在“世界四大名贵宝石”(钻石、祖母绿、红宝石、蓝宝石中占了两位,实属难能可贵。红宝石被选作七月诞生石,象征富贵荣耀,天真活泼和火红的爱情;蓝宝石被选作九月诞生石,象征慈爱尊严、德高望重和忠诚坚毅。红宝石又是结婚35周年、蓝宝石是结婚45周年的纪念石;中国古代将红宝石和蓝宝石镶嵌于官员的朝服冠顶,作为权力和地位的象征。刚玉的化学成分为三氧化二铝(Al_2O_3),属于六方晶系,硬度9,折光率1.76—1.77。宝石级一般均为半透明至透明。“金无足赤”,刚玉矿物的化学成分也不纯,常有少量其他阳离子
Birthstone of July: Ruby Birthstone of September: Sapphire Rubies and sapphires belong to the same corundum mineral composition, and are truly valuable in the world’s four most precious gems (diamonds, emeralds, rubies and sapphires) Selected as the birthstone of July, a symbol of wealth and glory, innocent lively and fiery love; sapphire was chosen as the birthstone of September, a symbol of love and dignity, respected and loyal determination. Ruby is the 35th anniversary of marriage, sapphire is the 45th anniversary of marriage In ancient China, rubies and sapphires were inlaid in the tops of officials’ kimono crowns, as a symbol of power and status. The chemical composition of corundum is Al 2 O 3, which belongs to the hexagonal system and has a hardness of 9 and a refractive index of 1.76 to 1.77. Gem grades are generally translucent to transparent. “Gold is not enough red,” corundum mineral chemical composition is not pure, often a small amount of other cations