Smallville, Superman's Early Years, Clark and Blue Kryptonite - YouTube
Aquarius – Sigma Rings
Tactical Black "Kryptonite" custom ring – Tactical Black Vault™
Thunder – Sigma Rings
Blue Kryptonite - Etsy Singapore
Cobalt – Sigma Rings
I like to think that Jon takes over as Superman and Clark wears a blue kryptonite ring so he can age with Lois and they pass away peacefully together. : r/superman