I find all natural gemstones silly at this point. You can buy flawless man-made versions of most of them for a fraction of the price of even quite included mined stones. Even when their values are similar, I'd still rather use the man-made ones as they are more energy-efficient.
I'm married, so I've bought a lot of jewelry, and she insisted on diamonds in her engagement ring (I tried to talk her out of it, but the marketing is strong and she wouldn't accept all the reasonable arguments against them). The jeweler insisted natural maintained more value and that man-made ones were close to natural in price. Ultimately, I took their advice on the diamonds, but with the exception of purple & lavender sapphires (which are always natural because nobody make them), all our colored stones are lab grown and I'm happiest with the lab grown stones for everything from quality to price to feeling better about their source...
Considering the evil of De Beers, I hope the company goes under due to their price fixing and that enough of us can prove to others that there's nothing special about a tiny chunk of naturally-occurring carbon.
On the other hand, I was obsessive about using all the recycled (because you have to mine it, might as well reuse what is already available) platinum I realistically could in them, along with having them fabricated by respected artisans, since all the value in jewelry is in the metal and workmanship.