Peaced Off It is interesting you say you haven't seen any 11% on jewelry at all. Anecdotally, I see a jewelry with 11% in a slot at least one out of 10, across three accounts. Usually on a junk category, or down at the bottom with a bunch of 1% first, but for you not to have seen any at all seems like a high deviation from a typical distribution curve. And there are fewer possible categories on jewelry vs weapons / armor, so if you do get one with 11% the odds of it being worthwhile are higher than on a weapon or armor.
Others have done this, with some actual numbers stored, and I believe the odds of finding 11% on jewelry in any given slot was around 7% in early testing. Not sure if that has been kept up or expanded;
Quali? 6% was significantly more common.
With 12 artifacts per day over the last 6 weeks (42 days), assuming 3 of those are jewelry on average, with 5 slots, that would be over 600 chances to get an 11% on jewelry. So on average, you should probably have seen 40 or so artifacts with at least an 11% by now, with reasonable odds of at least a few being useful - there are only 7 possible categories for jewelry, and one is great (all resources), two decent (oil looted and NTG odds), and only one bad (library gold discount). Resource refund is situational, food and gold value depends on how your walls are doing.
I am sorry to hear that you haven't seen anything good in that time. It seems less that
LitanyOfFire is having a string of great luck (all my accounts have at least one similar quality item, one has two that are better), than that you are having some very poor luck. I hate that aspect of the museum, hope it averages out for you soon. The odds are decent that it will eventually, if you keep crafting. I won't say to level up your 1% artifacts, supplies and blueprints are way more difficult than finding decent stats on jewelry at level 1/2.