Does anyone know what platinum is mixed with when made into earrings please?

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I can't find any info on the site where I bought the jewellery from.

Usually Ruthenium, Iridium, Cobalt or Copper usually in alloys with 90 - 95% platinum in things like wedding rings.

Platinum-Silver alloy is 2 parts Silver and 1 part Platinum used in some jewelery.

Type 'Platinum Alloy' into Google and various websites pop up with lots of technical info.

My jewellery is earrings so I don't know if that makes a difference. I will check through google, thank you.

Just heard back from the jewellers that there is no nickel in my earrings and the 5% of other stuff is hypoallergenic. When I was younger cheaper hypoallergenic earrings make my ears sore on about day 3. I am just why I can't wear earrings for more than a couple of days be them cheap or very expensive. Any ideas? TIA.