(disclaimer: this is past hearsay, do not check for accuracy
gemstones version 1.0 are too powerful for mortals^^ at least at there high levels.
The problem will be addressed most likely by an extreme reassessment of the current gemstones and a further weakening of their bonuses. What I think most people do not understand is exactly how exceptional gemstones can be. It wouldn't be a stretch to say that with the right combination of high level gemstones a single player could becoming completely unstoppable outside of the auto-death GM rune. Thus because the gemstones can have such stellar effects and cause what I can assume could be considered massive imbalances (this can already be demonstrated with certain low level gems and item combinations) they were made to be exceptionally rare. Rather then taking the opportunity away from players to get gems at all it seems the choice was just to make it an extremely high bar to meet.
Also you did forget to include the failure rate in gem fusion, if you add the chances of a failed fusion with high level gems, its more likely that you'll see a level 10 stone some time in 22XX
Post VBU I believe gems were going to to be more common in there lower levels but drastically weaker then they are now, however this is only hearsay until someone developing decides to stop in and give some more conclusive information on gemstones.
Edit:@Estralis tell us all your VBU secrets ^^