all gems from all monsters follow this drop rate:
gold investigation box: 13%
silver investigation box: 6%
body carve: 2%
capture: 2%
tail carve: 2%
wound head: 2%
plunderblade: 1%
from a mathematical stand point you should get one gem from every 8 gold boxes, but rnjesus doesn't play nice
edit: end boss and zorah have different loot tables because they don't have investigations
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