The Thracian word zelta
Word zelta
Meaning gold
See also Proto-Indo-European: *ĝhel-1, ĝhelǝ-, ĝhlē- ‘to shine, green, gold’

Comments
See J. Pokorny's 'Indogermanisches Etymologisches Wörterbuch'

Other words that might be of interest
bend ‘to bind’, saldas ‘golden’, skalp ‘to beetle, to hit’, skaplis ‘axe’, traus- ‘to break’