What are the odds of finding two pearls in a row while diving?

[EmGee]

Happened to me just this morning. I rarely find a pearl while diving, mostly just get them from Pascal. And it was my first two dives on top of that. I really would like to know the odds of that happening, I doubt it's common

 

[CovisGod]

I have only ever fpund one pearl diving so I'd say two in a row is pretty rare