We're a month into the patch, not a year. Prices are already falling sharply and these gems will be best-in-slot for the next 2-3 years of this server at the minimum.However, you mention the change that was applied too all lunarites, still doesn't change the fact it's expensive and/or tedious to craft t2/t3 earthglow gems.
The t2 -> t3 upgrade which has already been nearly halved should definitely cost more than the t1 -> t2 upgrade period.
On the topic of other lunarites, Galeglow lunarite is essentially free in the sense of having no out of pocket cost considering the supply you get from mistsong (which if you're going for t3 gems you can easily 5man). Naval arena is fixed now so the old kyrios badge gems (t2/t3 earth equiv) are easily obtainable (you can easily get 100-200 badges a day). Waveglow lunarite is 10g each if that, lol. Players can easily grow narcissus/azalea and run charcoal for the sturdies.
T3 gems are really not that expensive outside of the scope of new players provided that you are actually serious about making gold on this server. If you have the time you can make 4-6k worth of items a day just from farming whalesong. Considering the amount of stats these gems give as well as how long they will be viable, they are extremely cheap IMO.