It has nothing to do with the time of wearing.

There is only one reason why it is opaque after a long time.

Diamonds are dirty.

One of the characteristics of diamonds is oleophilicity.

Oil on the skin

Dust in the air will attach to it.

A long time.

The surface of the diamond will be blurred.

It's best to take it to a jewelry store for cleaning.

Or use a special ultrasonic cleaner to wash it yourself.

And it can be washed with ordinary hand sanitizer.

Then rinse with water.

Finally, dry it with a soft cloth.