From Old French jargonce.
jargonça f (plural jargonças)
- A variety of zircon regarded as a gemstone.
c. 1250, Alfonso X, Lapidario, f. 100r.:DEla primera faz del ſigno piſces es la piedra q̃ a nombre iargõça uermeia.- Of the first facet of the sign of Pisces is a stone called red zircon.
c. 1250, Alfonso X, Lapidario, f. 102v.:Ivpiter a poder sobre la piedra que a nõbre jargonça amariella.- Jupiter has power over the stone called yellow zircon.