One moody dwarf demands raw gems.
green, clear and crystal glass
The dwarf in question has grabbed one crystal glass; apparently he demands more. The pattern is:
pictures of an ore mine, 6 blinks (3 platinum)
rough gems, 4 blinks (1 crystal glass)
skeletons, 2 blinks (horse bones)
ore mine, 2 blinks (hematite)
stacked cloth, 2 blinks (silk)
square blocks, 2 blinks (jet block)
stacked leather, 2 blinks (whale leather)
This could well become one hell of an artifact, and I'm eager to see it happen (although the dwarf in question will probably become a furnace operator).
But what coudl be the last gem? Is there anything common missing from the list, or am I stuck with the once-in-a-lifetime chance of recovering one of the really rare gems?
What also strikes me as odd is that he jumped the queue. Usually dwarves not only need specific materials, they also pick them up in a certain order. The pattern is as explained, and as we only had two platinum easily available, he sat idle until the third was mined. But then he was content with one unit of glass and went on fetching bones etc. There was another break for the jet block, he didn't go for leather until the block was made. So why did he ignore the second gem?