[GOD:Amaterasu]
[ITEM:(210)Triton's Conch] should always be your first item. The aura of it stacks with your 1, and it's like a double Ama 1. Must build item.
Second item should be the defense type you need for your solo lane opponent. As always when looking at defense items, counter building is a priority. Keep that in mind when building defense items! A nice general pair of defense items Ama likes is Berserker's for physical and Shogun's for magical. They both give her attack speed, which is great. AS in smite 2 is a lot less abundant than in Smite 1, so it's a lot more difficult for tanks especially to get AS.
Third item is also a rather fixed slot, [ITEM:(163)Gem of Focus]. Gives you a boost of Int (Ama is an Int character. Idk what the game says, Int is better than Str on her) and a boost of CDR. The passive stacks off of each use of Ama's 1, so she can keep it stacked very easily. Fantastic item on her.
Fourth item you need to go the defense you did NOT go in the second slot. If one damage type in particular is a worry, then feel free to go a second item in that defense type. Generally though, here you'd slot in the Berserker's/Shogun's (whichever you didn't go yet).
Fifth and sixth item are very variable, debating on what you need at the time. The optional items listed above are nice flex items that work on Ama depending on the matchup. I do highly recommend Spirit Robe, though. It gives prots of each and gives her a lot of Mitigations when she gets CC'd (Ama is a bit squishier than only tanks due to being a late game hyper carry as well, so the Spirit Robe mitigations when CC'd ((her biggest weakness)) is really helpful).
Finally, these are just items that I've tested and found to work decently/well on Amaterasu! Definitely do not take this as an end-all-be-all, there's gotta be more items she works well with. This is just a collection of, in my experimenting, the most consistent items.