Seen 3 of these for sale last night in Bazaar. price varied quite greatly between them one being 9k, another 20k and the third for 65k. Decided tobuy the one for 9k after thinking thoughrouly over what value it should be. The stats are a bit lower than some comparable earrings but the resists, hp, and end send it over the top.
My guess is a good value should be somewhere between 15-20k as a bloodmetal is selling for 10-15k (on Povar).
Just a thought :)