I own 2 Russian pink diamonds, bought before the sanctions against Russian diamonds.I agree with you on both counts. It's cheap to make and buy LG, but they still have to be cut and polished (which granted is all done by lasers and machines) many are outsourced in India, handed on through highly regulated companies and outsourced to smaller communities that may not have such strict labour regs on labour practices, not know them or disregard them. Lab-grown are absolutely NOT the ethical choice many believe them to be - and that's not including the vast amount of energy needed for HPHT/CVD.
Russian diamonds are illegal to buy for many people because there are sanctions against the country in many parts of the world, including where @cecchetti and I live. That is all. It is illegal for us to buy them even from third parties, or sell them (Reg '24). Likewise the EU, perhaps the US too.
I think if anyone buys diamonds informed and from traceable means there should be no problem, GL or natural. There is a lot of fear of buying LG unwittingly, but soon that will be a thing of the past with the new testing equipment obtainable.
It’s hard to value them(I’m having one valued now), as if they were Argyle they would be very valuable, but as @papertiger rightly said, I can’t sell them, however I Can insure and wear them, however I couldn’t replace them.
This is off topic however, sorry!