lol, and I should write in coherent sentences...guess I'll need to get some sleep after all. I was wondering what birthstones are in general, but I found out in the meantime. Mine's an aquamarine by the way.
And I love the idea of putting your Master's birthstone in your collar...a nice subtle gesture that means so much but isn't obvious to just anyone.
To throw in my two cents at the original question - I really can't make up my mind about this. I really like the feel of leather around my neck and having a more 'in your face' kind of collar. On the other hand I really adore some of the more jewelry like collars...preferably one that is screwed close. Either way I would opt for a personalized collar - maybe having a message or name engraved? I really like the idea of birthstones, too...or anything that has a special meaning for both the Master and the sub. *sighs*