94.彩色宝石的质量大小对价值的影响

The value of colored gems is significantly influenced by their size， often measured in carats.克拉标准区分大宝石，如2克拉钻石和缅甸的大型红宝石，而蓝宝石、祖母绿等需要达到较大克拉数才被视为大宝石。稀有性直接影响宝石的价格。