Game Mechanics: Jewelcrafting combine

[Arta]

When trying to combine Enchanted Gold Bar and Imbued Plains Pebble in a Jeweler's Kit to produce Imbued Golden Plains Earring (http://wiki.project1999.com/Imbued_G...Plains_Earring ), the message "You cannot combine these items in this container type!" Even with a Karana aligned character. Any help or news with this particular situation would be much appreciated. Thank you for your time!