The difference is, there are no good places to farm the gems you need for high end JC (uncuts, raws, etc). For silks and pelts, they drop on certain mob types, so you can restrict yourself to those types. That speeds it up considerably.
Tatankaa (94 Inquis)/Urkell (34 Conj)/ Seanthornton (24 Pally), <Inisfree> Freeport server
Tatanka Wolfdancer, 87 Wood Elf Druid
Anaceup Mysleeves, 85 Erudite Mage
Snookims Whinslow, 85 Erudite Enchanter
<Inisfree>, Tunare (Seventh Hammer!)