RE: 15:4721 Sep 2020 21:57
bald_eagle,
That's like suggesting that if people buy anything, from property (houses) to multi-million pound luxury yachts, outside the controls of a trusted and regulated agent, then there may be criminal activity to consider.
I believe that there are money-laundering processes applicable to private business, just like those operating through a recognized agent. Deals should be declared and taxes paid where applicable.
If deals are not declared then you may well have a valid argument, but in this case they were declared.
I suspect that big deals are done privately (off-market) mainly to avoid agent's fees and that is fairly sensible.
The smaller players may be in no position to act outside the realm of agents, but we can't blame the bigger players, with private connections, from attempting to bypass the middlemen who take their cut for providing a service/taking a risk.
In the case of diamond buying, many smaller players (you and I) would seek a trusted and establishes company to buy from, only the bigger players would be in a position to have access to ways and means of dealing amongst themselves.