Guild Wars 2

I see that jewels can be dropped into the mystic forge, however I don’t know a single recipe that uses them. GW2 Wiki has nothing on them and internet searches have turned up nothing. I am curious though, is there any valid recipe using jewels?

Putting jewels and/or crest in the MF have a chance of giving you a higher tier gem/crest. Normally it isn’t worth it due to the fact that you have a chance to recieve a crest if you put jewels in, and you cannot do crafting and such with crest.