Games considered by ChessBase 17 to be both “strong” and “most beautiful”.
Strong games seem to filter on at least 2400 and at least 10 moves. Beauty score is determined according to interesting play, such as sacrifices, and is given between zero and three “medals”. Most beautiful games are those with three medals.
Sources are Playchess, Playchess Infinity, CCRL, CEGT, FGRL, FICS, JCER, the Gladiators DB, and the Lc0 games posted here.
Elegance DB — 270,693 games | 266 MB PGN | 46 MB 7z