戒指内圈尺寸为21.5mm直径，可按照你个人戒指尺寸进行等比例放大缩小。比如你的戒指尺寸为24， 那么就计算24/21.5 = 111.63%； 或者你的是15， 那么就计算15/21.5 = 69.77%， 以此类推。

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