There are a handful of hypoallergenic metals that are non-irritant AND other unique, alternative materials used to make rings that won’t cause skin irritation:
• Titanium
• Platinum
• Nickel-bound Tungsten*
• Ceramic
• Elysium
• Silicone
However, if you are allergic to Nickel please note that Gibeon Meteorite does contain around 7% nickel that is not bonded.
Nickel-bound tungsten carbide is 100% hypoallergenic. That seems unlikely because nickel is the usual suspect metal allergen, but because the tungsten is bound to the nickel, it prevents it from being an irritant. Because of science.