ring

For my b-day I would like a cocktail ring.  But just a single big gem stone preferable emerald cut. A huge emerald would be nice but thinking the price would give Joe a heart attack, but then again maybe he would think to upgrade my diamond or my band would be cheap. 

I think I found one but the stone is a London Blue topaz.  I didn't think I would be picky but I'm not sure I want a blue stone.  It is blue but not light and not really dark just true blue and huge or on my hand huge anyway.