How to prove these are genuine Mikimoto pearls

[Pearl Dreams]

Just so we all know, Yssie is a "she".

 

[pattye]

There's nothing about this Miki strand that seems inaccurate to me. Yes, I recall the clasp can have a diamond and the pearls themselves seem to be excellent quality. Plus having the 24" length is a bonus.
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You might check out RubyLane.com as they list lots of Mikimoto jewelry. Sorry to hear you got hassled by ebay. I've been curious about ebay's authentication process.