Sixth at the 2011 IAAF World Youth Championships, Jones took the lead in the opening round with 6.32m and improved to 6.34m into a strong -2.7m/s head wind.
It proved to be sufficient for gold although the conditions contributed to it being the shortest winning distance in the history of the World Junior Championships.
Norway’s Nadia Akpana Assa, who led the qualification with a national junior record of 6.39m, came a close second with 6.31m while Germany’s Maryse Luzolo clinched the bronze medal with 6.24m.
With strong head wind conditions, only half of the 12 finalists managed to jump farther than six metres in the final.
Javier Clavelo Robinson for the IAAF