Answered by Ustadha Shazia Ahmad
Are Men Allowed to Wear Necklaces?
It says in the Reliance of the Traveller:
f17.8 It is lawful (A: for both sexes) to wear a silver ring (A: the sunna for men being to do so on the little finger, of either hand) and (A: for men) to decorate battle weapons with silver, but not riding gear such as saddles and the like, nor an inkwell, writing utensil case, work knife, penknife, or lamp fixture–even if in a mosque nor to have silver jewelry other than rings, such as a necklace, armband, bracelet (O: because these resemble the habits of women, and it is unlawful for men to imitate women), or a crown.
Please see more details here:
What Kinds of Jewelry and Body Piercing Are Permissible for Men?
Is Wearing a Silver Bracelet Permissible for Men?
Is It Permissible For Someone To Wear a Bracelet With Their Birthstone In It?
Is Using a Ta’wiz (Amulet) Permissible?
Jewelry for Men? Rings?
May Allah give you the best of this world and the next.
[Ustadha] Shazia Ahmad
Checked and Approved by Shaykh Faraz Rabbani
Ustadha Shazia Ahmad lived in Damascus, Syria, for two years, where she studied aqidah, fiqh, tajweed, Tafseer, and Arabic. She then attended the University of Texas at Austin, where she completed her Master’s in Arabic. Afterward, she moved to Amman, Jordan, where she studied fiqh, Arabic, and other sciences. She recently moved back to Mississauga, Canada, where she lives with her family.