"even if you have " is correct. "even if you have done" is also a possibility, but the word "done" is not necessary.
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Henry74Hello everyone,I'm not sure if I have to use did or had to echo the verb No, use 'have'. in the first sentence in what follows.- Have you ever owned an actual diamond? Andevenif you ____, how did you know it was your best friend?Just to clarify, that is something I might have said to a girl, hinting at the expression
GPYIt seems that there are differences between US and UK usage then.