Raphael Kaufman -“The standards of Jewish female adornment has always followed the general practice. No such gezeirah was issued on adornments so they continue to follow the general custom such as earings, necklaces, rings, brooches, etc. If nose rings are worn by the general population of women, they are muttar, disgusting, but muttar.”
I’m not sure whether your Sevara is a normal Sevara or a Boich Sevara, but either way you must bring a valid proof to it.
A comparison to hair covering is Not a proof, because you could compare it to clothes and certain clothing are Ossur (eg. Red dresses). Without a proof from Halacha you can’t say Mutter even if you would have a valid Sevara because this is an Issur D’oraysa. And even If your Sevara makes it into a Sofek -A Sofek D’oraysa is Ossur acc. to Halacha!