Ok, I have heard many opinions about this event. Some ppl are happy, some are angry. Well here I just talk about the gem abrassive:
Since we have rank 8, many of you have been complaining about its difficulty: high HP mobs, high mdef mobs, 1 damage, blabla… so IMC has buff the gem effect to help us.
Now pls have a look at gem exp base
According to what @Nekorin said here, with 4 hours full time playing he can get get around 2 level 7 gems ~ 440k gem exp. To make a gem to lv8 you need 1.1m exp so with 10 hours full time playing you can get 1 gem level 8 if lucky. Yes, 10 hour playing game without stopping. Feel OP? oh I heard ppl said that game will be full of gem level 10 so let’s make the other calculation. To make a level 10 gem you need 9m735k exp gem. So suppose you are a hard core player that can “abuse” event for 10 hours per day, you will need 10 days to make 1 level 10 gem. And this event lasts for about 20 days so you can get 2 lv10 gem as maximum.
I’m pretty sure you guys all want to make at least 2 gems for armor, 2 gems for pant, 2 gems for gloves and 2 gems for boots. Suppose you are using orange type weapon so you need 3 more gems. All you need are 11 gems. Suppose all gems are lv8, the totall gem exp you can earn buy abusing event for 20 days is enough to make those 11 lv8 gem (and 1 more level 10 if lucky).
Problem is how many people can manage to play 10 hours nonstop per day for 20 days of event to get 2 level 10 gems? For normal players, they will end up with around 10-15 level 8 gems (or even fewer). Not mention some people will stop joining this “public abusing event” if they get enough level 8 gems they want. Also due to gem efficiency, I think many players will choose to make some level 8 gems instead of trying to make 1 level 10. Everyone is just hyped because this is the first day of event. Not sure how it will be next week. So please stop dreaming about a market with full of lv10 gem.
(But it may be full of level 8 - RIP gem sellers LOL)
Some people also talk about breaking game content/balance or something…Well, imo gem’s biggest function here is to to help players have more HP/mdef and not get 1 hit KO by mobs. This won’t affect much or break anything in PvE aspect.(it may make some differences in PvP and GvG)
In damage aspect, you should worry about gacha 2.0 with bless shard drop and 550% damage (stage 10) weapon compare to few more matk/max atk from gems. In the end, gem is not so OP compare to other things as you think even it is level 10.
The biggest thing here is this event is free and available to everyone. Not like gacha cubes, you still can get what you want without paying a dollar so just enjoy it and have fun with other players. I’m not sure if you can have other chance to enjoy event with massive gathering atmosphere like this again. 
IMC has patched this event. Now only 1 player can interact with the plant. If someone is spamming spacebar or just hold the notice board on a plant, other players can’t interact/see the noticebar (or spam spacebar) on the that plant - even the owner!
edit 1: update stats due to previous wrong calculation
note: The final result (11 gem level 8 + 1 gem level 10) or (2 gems level 10) can be archived if only you can manage to play 10 hours nonstop per day.


gems biggest function atm imo is giving more HP and mdef which helps you survive. About damage aspect, it won’t affect too much. This event looks like just help you don’t get 1 hit KO from mobs, not 1 hit kill mob like transcendence LOL