变石又称为亚历山大石,是金绿宝石(BeAl_2O_4)的一种含铬的变种,是极为珍贵的高档宝石,它与珍珠和月长石交替作为六月的生辰石。之所以称其为变石,是因为它的颜色在不同光照条件下会发生变化从而成为一种非常有趣的宝石。许多诗人、作家对它进行描述、赞誉,称它是:“白昼里的祖母绿,黑夜里的红宝石。”持有变石 Rock, also known as Alexandrite, is a chromium-containing variant of BeAl 2 O 4, an extremely precious gemstone that alternates with pearls and moonstone as the birthstone of June. The reason why it is called a stone is because its color changes under different light conditions and thus becomes a very interesting gem. Many poets and writers have described and praised it as saying: “Emerald during the day and ruby ​​in the night.”