For Radial Physical Gems (other gem types are possible but rare):
You need to have access to Pthumeru Ihyll Root with Fetid/Rotten/Cursed offerings and you need 1 blue elixir per run:
glyph: "rkkefhkt"
Route:
- First bonus area to the right after you spawn, head down the first stair and kill the "crystal lizard" then head back to the normal way.
- After the 2nd lamp on the balcony overlooking the cave, jump down to the left and head for the scorpions
- Enter the cave on the left, ignore the scorpions, while in the cave just before you leave the dark part, pop the blue elixir
- as you exit the cave, under the bridge arch to your right is another crystal lizard. Kill it and quickly move on into the next room with the pig-pile.
- In this room you need to reach the lever without the sage or the abductor noticing you. There are also spiders...(I usually RUN past the pig-pile on the left side until I reach the wall, then walk along the wall until I reach the lever)
- After pulling the lever sprint out of there without getting hit
- The boss door is opposite from where you dropped down after the 2nd lamp
- Boss is merciless watchers, cheese with Scythe R2 for safe strats or kill however you see fit (easiest boss in the game).
One run takes about 3 minutes and nets you 3 gems and often times 1-2 chunks. The crystal lizards drop gems (5)14-17 and (6)16-18. The boss will always drop a (6)17-19. What you are looking for are gems with + stamina cost or - weapon durability. You can also keep the ones with - attack against beasts/kin but you will need a weapon against each type if you want to specialize them this way. Sell all the gems that have bad properties or you will lose track of your inventory real fast as you will get about 50 gems per hour.
For triangle gems just use one one of the common Isz dungeons with merciless watcher 1st boss like "5pwujscd". Triangles can be any property (arcane, fire, bolt, physical) which makes farming them a pain in the ass.