[zelenin]

copy-paste from esoui code (/esoui/ingame/inventory/sharedinventory.lua):

    local isFromCrownCrate = IsItemFromCrownCrate(bagId, slotIndex)
    slot.isGemmable = false
    slot.requiredPerGemConversion = nil
    slot.gemsAwardedPerConversion = nil
    if isFromCrownCrate then
        local requiredPerGemConversion, gemsAwardedPerConversion = GetNumCrownGemsFromItemManualGemification(bagId, slotIndex)
        if requiredPerGemConversion > 0 and gemsAwardedPerConversion > 0 then
            slot.requiredPerGemConversion = requiredPerGemConversion
            slot.gemsAwardedPerConversion = gemsAwardedPerConversion
            slot.isGemmable = true
        end
    end