Diamonds, despite being very expensive, aren't really all that expensive -- compared to the price of most marriages...
You know, the long term fixed and recurring costs...
You know, the EBITDA, the COGS, the line items, the Chart Of Accounts, and all of that good stuff from Accounting... <g>
In other words, if someone is getting married, the high cost of a diamond, while indeed substantial -- is still probably only going to be the least of that married person's financial problems, present or future... <g>