I have cash and am looking to do one of three things: 1) Deposit in my bank @ 4.00% interest, 2) Buy Gold, or 3) Buy a Diamond. The diamond I have in mind is H-color/SI2/Marquise/2.70 carat/very fine cut. The question being do/will Diamonds fetch a 5% (?) increase in wholesale/retail price year-over-year or could this stone not budge an inch in price over the years? Of course, I want the Diamond, and am looking for financial justification to "go ahead" and make the purchase. 