Having A Gemstones that are worth 7kk each completely breaks the mechanics of the game.
It's impossible to get A-grade gear, except for players who farm epic bosses. This leads to no difference between having levels 52 and 61, since it's much cheaper and better to buy +6 B sets. Of course, there are also +6 A sets, but only a few people have them.
This issue cascades further. It completely breaks the crafting of A-grade gear. No one would spend 600kk on Gemstones to craft A-grade weapons with only a 60% success chance. The weapon itself costs less. Additionally, bounty hunters become completely useless at high levels since no one needs A-grade recipes, except maybe a few that require B-grade gems.
This situation makes A-grade weapons mostly useless, as inserting a rune is never worth it. Even if you somehow craft the item or get it from a drop or a Raid Boss, you still have to obtain Cloths, which makes sets 20 times more expensive. This, in turn, leads to the strategy of enchanting sets to +6 and only then unpacking them.
I would suggest the following changes:
Increase the drop rate of Gemstones by at least 10 times and distribute them among more mobs. A-grade Gemstones shouldn't cost 1000 times more than B-grade.
Add the ability to spoil them or obtain them from a quest.
Reduce the number of Gemstones required to craft an item if the top options lead to imbalance.
I completely understand that A-grade gear is top-tier and should be expensive, but not to the degree where it is worth as much as tier-1 epic gear.