Ok, so I've been considering an uprage of my wife's ER. When this COVID-19 horror ends, hopefully I will be able to make dreams come true. But my dreams vary. First I wanted a super ideal MRB ~1,6 ct. Now, I started pondering a FCD (pink-ish area) when looking around Leibish inventory etc.
Let's assume I'll have a budget of $20k (diamond + ring) and my wife doesn't care
Which option would you suggest in terms of retaining value and overall uniqueness? I'm well aware that within this budget a FCD won't be a massive rock (in contrast with a substantial ~7,5 mm of MRB 1,6 ct). But having a not-so-common FCD on my wife's finger is tempting… Beauty is in the eye of the beholder, but please help my eyes 
Let's assume I'll have a budget of $20k (diamond + ring) and my wife doesn't care