This is the Marine Serre Insert Ring in MT50 Gold.
Baker
Diesel
Homme Essentials
Lox And Chain
A Bathing Ape
Rhude
Serge Denimes
Lox & Chain
Chloé
Deathwish
Versace
Tiffany & Co.
Maple
Craftd London
Slb
Maison Margiela
Ruban
Keila Jewelry
Twojeys
