I only got my Aventurine yesterday but due to some prefarming he is already usable now, feels amazing to use:
Need to finish levelling the relic pieces and I may need to farm a few replacement pieces. Will need to see if I end up at 4k defence or not and I would like his crit rate to be higher. Also missing one speed roll on a random piece to hit 134 speed, very unfortunate.
Traces I will probably take to lv8/9 for now in the next few days too.
Overall, I am so impressed with him as a character. He feels awesome to use in my Ratio and Argenti team, love it. For my Jing Yuan I will continue to use Fu Xuan instead, solely because he needs her crit rate buff due to bad crit rate rolls on his relics.