i’m plat 3 rn and i was curious to see what ranks my opponent were last act so i checked and realized that they were all high gold/ low plat. if plat is the new gold then what is diamond and ascendant?

For context I was playing yesterday after I came back from a 10 hr day at college. Just sat down and wanted to unwind. I did pretty well in a dm and I ran a comp. In the comp I was doing ok in the first half. I wasn't over preforming but I...