can a muslim wear a chain with a little kaaba ?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.

It is permissible for the Muslim woman to wear a chain with a little Ka‘bah or anything which is Islamically lawful, since women are in the habit of adorning themselves by wearing chains. Men, however, are not permitted to wear chains because this involves imitation of women. For further information, refer to Fatwa 89084.

Allaah Knows best.