There are NOT noticeable differences between a $30k diamond and a $3k moissanite stone. A better analogy would be $100 "professional HDMI cable" and a $10 standard HDMI cable.
My wife and I felt the same way too, until we actually compared them. The sparkle and brilliance in the diamond was dramatically better than any other stone we compared it to. We went into ring shopping pretty determined to not get a diamond, and yet still bought one.
Lab diamonds aren't really cheaper than natural unless you are talking about pure shit quality or really tiny ones.
I think the biggest problem is that most people have not seen moissanite in person, and don't realize that it can compare very favorably (if not more so) to a diamond. Glad to say I've managed to sway a couple of my friends so far on that front ;) Here's some pics: https://www.flickr.com/photos/chix0r/sets/72157637715040063
Personally I think a synthetic diamond is better than a natural one, but IFLS.
> Today, De Beers hold on the industry supply chain is less strong. And yet, price continue to rise as new deposits haven’t been found recently and demand for diamonds is increasing in India and China. For now, it’s less necessary that the company monopolize the supply chain because its lie that a diamond is a proxy for a man’s worth in life has infected the rest of the world.
So the monopoly is gone, prices are rising because of fixed supply in the face of increasing demand, but diamonds are still bullshit because their value is based on a consumer irrationality.
I hate to break it to the guy, but half of the consumer economy is built on irrationality (and half of silicon valley is built on advertising that irrationality to consumers). Pretty much every luxury good is purchased for signaling reasons. Paying more for a diamond with a particular clarity grade or color isn't any less irrational than paying more for a top-end BMW, even though you'll never take it over 60 because of all the traffic.