The Amethysts are really nice with only 20 energy cost… but that level 9 damage requirement and the effectiveness just make it a difficult forge to have much remaining for action speed… anything less than level 7 busy bee makes them a waste of time.
Topaz only use 22 energy so can still swing these for a long time before needing a break and the base durability is a bonus along with them being easier to forge. Just do not settle for level 6 busy bee, there is a massive drop off in action speed if you don’t make it to 7 at least.