The more rational decision, IMO, assuming you still want to signal wealth, is to buy neither, collude with your supposed life partner, buy a gigantic, flawless moissanite that you both agree to say is a natural diamond that cost 50k. Then secretly put the money you didn't spend on sparkling carbon into some appreciating asset. Rivals are still sick with envy, you have a fun joint venture bamboozle to laugh about, and the mortgage gets paid off a few years early.