In normal jewellery making you are unlikely to come across or
need diethyl ether, commonly referred to just as ether. Apparently
though it has some gemological applications (what?).
Thank you for your as well, and to answer the above
The main use is for helping to distinguish between amber and copal
resin. There may be more sophisticated ways of detection these days,
but it used to be and is still helpful in separating the two. The
surface of amber remains unaffected whilst copal, due to its more
recent formation, becomes tacky. If you check in most amber detection
chapters of the various books you will most likely find reference to
this very topic. Nowadays with infra-red etc... it may not be used on
such a regular basis, but that is usually why ether is around in a
Hope that helps a little.
Regards - Nick