FYI, the family is on good trading terms with a local gold/silver/used jewelry dealer where diamonds can be had for very reasonable cost.
Recently a conversation there was about people who come in to sell their diamonds being shocked at how little it’s true value was vs. what whey bought it for at a chain retail jewelry outlet—not mentioning any specific names, but they’re all the same....
The value I got when selling a diamond back was about 1/3 of what was paid for it at retail.