I hope you didn't lay a wager on your claim. :)
Which is Queen and Which is King

Generally not the case. But I am sure it will be illegal fairly soon to make one larger than the other .

King is higher than Queen. Also, the Queen has usually a rounder shape than the King, except for some of the very abstract sets. Both rules indicate to the same piece here...
Hi guys,
straight to the point. My friends have been challenging my claim that the taller piece is the queen and the smaller one the king. They believe the taller one is the king because of its crown. I believe it's the queen since it's the strongest piece, therefore taller.
(this is a very fancy board and chess set possibly from Iran)
He dared me to upload it here so here we are
WHAT DO YOU GUYS THINK?
The queen is the strongest piece yes, but the king is the most priceless piece on the board.
The taller piece is the king here, however the king is not always the tallest piece in every set. In some sets it can be the rooks or the knights. Nothing comes to mind now but I wouldn't be surprised to see a set with the queens being tallest. You can tell on this set the King is the taller piece because of the crown and the Queen is the next piece down because of the orb, the queen here is "a big pawn" or the pawns can "dream" of being promoted to queen. These are very old piece signatures for those two pieces. ... edit: ok so looking through my own collection just now I found 4 sets where the queen is taller than the king, so yes, certainly that can happen.
The taller piece is the king here, however the king is not always the tallest piece in every set. In some sets it can be the rooks or the knights. Nothing comes to mind now but I wouldn't be surprised to see a set with the queens being tallest. You can tell on this set the King is the taller piece because of the crown and the Queen is the next piece down because of the orb, the queen here is "a big pawn" or the pawns can "dream" of being promoted to queen. These are very old piece signatures for those two pieces. ... edit: ok so looking through my own collection just now I found 4 sets where the queen is taller than the king, so yes, certainly that can happen.
I guess it depends on the manufacturers; the king is indeed more valuable but undeniably the queen is the strongest piece in terms of mobility and strength. Have not seen one set of those kind yet though.
I guess should qualify that and say in the vast majority of sets since the Staunton design the king will obviously be the tallest piece. I just wanted to clarify you can't *always* count on that as a rule and sometimes need to look at other things as well.

Which of the two can move further than 1 square? That would be the queen and the other one the king. Easy peasy.

When the craftsman who hand-craft the Kings and Queens probably intend for specific pieces to be the King and Queen. Would you really swap their genders like that, against the intention of their very creators? /s

Hi guys,
straight to the point. My friends have been challenging my claim that the taller piece is the queen and the smaller one the king. They believe the taller one is the king because of its crown. I believe it's the queen since it's the strongest piece, therefore taller.
(this is a very fancy board and chess set possibly from Iran)
He dared me to upload it here so here we are
WHAT DO YOU GUYS THINK?