Love has no Boundaries

Romeo falls madly in love with Juliet and spots her on the balcony (it was legal to be a peeping Tom back then). Romeo speaks, “O that he could be a ‘ring’ upon that hand, so he may touch that cheek.” (A little poetic license here.) So he hatches a plot:  he will a start a diet high in protein, high in sodium, and dehydrate himself in the hope of inducing a kidney stone (diamonds were very expensive back then) to adorn the simple gold band he is saving for Juliet.   In short order, his extreme diet “works” producing a couple of days of excruciating pain after which he finally passes the stone and heads to his favorite local jeweler, Mercutio.

Question: Where is the likely site where the stone was lodged in Romeos genitourinary system?

Postscript: Unfortunately, Tybalt, Mercutio’s employer, applies muriatic acid to the stone and it disintegrates. Romeo slays Tybalt for his misdeeds and is banned from the town.  The local friar is imprisoned for trying to help Juliet escape with Romeo.