I'm tired of these supports who refuse to get a SS.
YELLOW AND BLUE TRINKETS DO NOT CUT IT FOR VISION. Get that through your head.
A support needs a SightStone. There is literally no excuse not to get one. All the items it can build into are pretty good. Also as a support, you do not want to ks your other laners. So going full damage is not ideal. RIOT even agrees with that. Supports are meant to get assists. So you can live with the 1 less main damage item and get a SightStone.
In case you are unaware of all the possible versions of Sightstones, here is a list. Pick one:

You even have gold income built into 3 of those options.
... Its more beneficial for team if u get offensive items and do damage (Cause u will always remember to do damage) than to invest all your gold into utility items and not use it. And no, its not always better to let others get kills. Especially if u DO plan to invest in utility items. More kills= more gold= faster utility items= better for team.
for example make inventory space just as precious to supports as to any other role.
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then
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+
x2 on my first back, if there is extra gold then I get
. Second back is
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depending on what I need. Next is a second tier item (examples are
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) and then on my next back I decide if I should finish my item from the Part I previous bought or get a sighstone depending how late in teh game it is and how is the game playing.
to provide that early warding on important objectives and useful for counter-jungling. Only a handful of junglers should go for anything other than trackers, support can't move around the map early so their wards are static but I guess that's not conceivable for anyone below gold.
just like junglers have to take
(free and recharges) >
+
which comes in handy when setting up death bushes. Alstar is really suited for the blind engage Not really possible when sitting on a ward.
is and
was.