The eyes themselves had the rare quality of chatoyance.

眼睛本身就有一种罕见的爱聊天的品质。

When jewels have chatoyance the colour in the lustre changes with movement in the light, and the colour of this girl's eyes seemed to vary between a light grey and a deep grey-blue.

当珠宝有光彩时， 光泽的颜色会随着光线的移动而变化，而这个女孩的眼睛的颜色似乎在浅灰色和深灰蓝色之间变化。