For the "black label" topic in this thread, people are referring to two completely different things. One is the logo on the table (the nameplate), the second is the cushion.
"Black Label" means the Diamond label on the end rail is black in color. This was an aesthetic only option many years back, during the "red label" days. There is zero difference between a black label Diamond and a red label Diamond, other than the color of the logo.
The "blue label" Diamonds have the legit difference in the wood rail bevel angles to improve the bouncing characteristic of the rail. The cushions were not changed between red and blue label. Artemis for 9', Diamond Black Cushions for 7' and 8', remained.
The "Diamond Black Cushion" is what Diamond uses on all tables smaller than 9', for about 20-25 years now. They use Artemis on all 9' tables. Way older than that in the 90's there were several other cushions tried.
In summary, "Diamond Black Cushion" has no correlation with "Diamond Black Label".
*I got all this info stalking this mechanics forum over the years