Pro tip: don’t hang stuff by the clasp. The weight can stretch them out if they are made of junk metal (most are).
Instead, hang them by the ring/chain the clasp clasps onto. You can use upside down earring hooks to string them up if you have a pack of spare, otherwise small head finish nails can usually accommodate the chains.
It can change, mostly related to health. For example viruses and diseases can alter iris color.
If it’s cloudy and dull it may also be early stage of clouding of your lenses (cataract).
If you haven’t seen an optometrist recently, you may want to get checked, just to be safe, they can rule out any ongoing problems :)
https://health.clevelandclinic.org/can-eye-color-change