the quality of showing many bright colours that change with movement

A lot of people when they catch a fish are amazed at the iridescence. 很多人抓到鱼时，都会对鱼身上变化斑斓的彩虹色感到惊奇。

The walls are greyish-blue to green, with a pearly iridescence. 墙壁是灰蓝色到绿色，带有珍珠般的彩虹色。