HELP needed! Shopify store Single or Pair option of variants

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Hi ,

I have a jewelry store selling single ear piercing. However, even though I have listed my jewelry as single piece and customer still thinking they are getting a pair. Therefore I wanted to have a button to show as a single or pair Option on the product page. I try to create a new variants but it does not update the price as pair? Does anyone have idea how I can add a button as single or pair of jewelry. Thank you very much