3 Greater Quintessence of Swiftness because u will get 405 movement speed in lvl 1 which is very good when your jungler comes to gank, or their jungler will gank you.

9 Greater Mark of Desolation because when u play solo top you will very often meet tanks with alot of armor.

9 Greater Seal of Resilience for good early game.

9 Greater Glyph of Shielding because you should play irelia offtank/tank and it's good for late game.

u can choose to build Irelia other ways than this. For example if they have a feeded ad carry u can go thornmail instead of force of nature

Pick these because u will get tanky and get 2% movement speed

ignite works for me because if one of the enemy team think that he can escape u use ignite and spam ur ulti if they escape with low hp.

Last hit with q so u get mana.