there is one way to "craft" relic fragments
the problem is, you need a legendary artifier and then buy a "blank" ring or brace from the yeweler and imbue the following on it:
on each ring or brace:
13% physical resist
13% cold resist
13% fire resist
13% poison resist
13% energy resist
if you unravel this ring, you should get a relic fragment
a colleague tested it and for 10 relic frags he need:
412 Magical Residue
80 diamonds
160 Saphire
128 Smaragde
112 Amethyst
344 rubys
have fun ;-)