There is nothing wrong if men wear silver in Islam. The Prophet (peace and blessings of Allah be upon him) had a ring of silver and his Companions wore rings. It is not permissible for men to wear chains.

If a woman wears coloured cosmetic contact lenses for her husband, there is nothing wrong with it. But if she is wearing coloured contact lenses where others will see her, then this should not cause any fitnah or temptation. Also, there is nothing wrong with wearing ophthalmic contact lenses on the advice of specialists

It is not permissible for men, just as it is not permissible for women, to trim their eyebrows.