To the Disklok in general.
The Gold is fairly recent, just minor tweaks to increase lock reliability.
The Diamond only came out a few months ago and has a special steel blend in key areas to resist angle grinder attack, but for all these improvements I - and we as a team - never came across one that had been successfully stolen with the original version and battery grinders were well and truly a thing by then.
We saw plenty of home CCTV where the sheets turn up, spot the disklok, shake their heads and head off without even touching the car. All but impossible to remove (even Trumpton struggle with all their heavyweight gear) and the noise they'd make would be seriously loud, so in most cases they'd spot the DL, move on, and steal a similar model from a neighbour instead.