Sometimes I support and other times JG. I get sightstone becuz my support champs are SLOW and immobile while I keep abilities for saving ADC.
That said, when I'm in jg I use my wards in top/bottom lane so that they get vision and ask them for a pink ward.
I don't always expect sup to get it but would request them if we are losing becuz of vision/ map awareness. That said, if
is sup, vision ward is not required. same with
. Their traps give vision.
You just need to discuss/ talk with your sup/adc on what to build. If sup refuses
ask them , politely, about gold. And if you are not playing aggressive, early game summoner then explain that too.