Mother of pearl

Iridescence is an optical phenomenon that gives mother of pearl its characteristic shine and produces a rainbow of different colours depending on how light hits it. The inside of certain seashells is made up of multiple thin layers of material, which are responsible for creating this shimmering effect. Incidentally, pearls are created in a similar process. The thin overlaying layers break and reflect light differently, resulting in a colour spectrum that you can also find in a rainbow.  

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