"synthetic" diamonds with far fewer impurities are far cheaper than "natural" diamonds of the same size.

The goalpost will always move because the things used to justify it are excuses and not real reasons.

Even De Beers announced they would start selling synthetics.

de beers is doing it as a pr move, selling them as 'budget' diamonds as an attempt to devalue them

Nice try. Manufacturing them also has non negligible costs. I'd only buy synthetics anyway. Not very keen on 18th century slavery, which is pretty close to what happens in diamond mines. In addition to that synthetics are more pure, so better quality if the cut and polishing is done right.

The above comment is correct. De Beers bought Lightbox to position synthetic diamonds as for “everyday jewelry” rather than special occasion jewelry such as engagement rings. So it essentially is to help protect diamond price levels and the allure or scarcity.

i think you misread my comment