Ruby for Legend (Red) Affixes. Amethyst for Set (Green) Affixes. Obsidian for Crystal (Cyan) Affixes. Angelite for random Normal (Yellow) or Epic (Orange) Affixes. Topaz for Epic (Orange) Affixes.
if you don’t have any Amethyst, then you need a different item with a useful Set Affix on it. or just use Kyanite to take Deadly Arts off and replace it with another Affix, even if it is only an Epic Affix. the other affixes look pretty good until you decide to change them or want a new item entirely.
before putting Mythic Affixes on any of your items, wait until you learn a little more, because making Mythic Items can get expensive, and if you make something you don’t like or that doesn’t work, that can get frustrating. also, a Mythic that works good with one Build might not work that good with another Build.
when I started Ascending for Perks, I didn’t put any Mythic Affixes on my Build until after my second or third Perk, because I didn’t have any room for them, they were hard to find the Myth Stones I needed to make them, and I wasn’t sure which ones I wanted to use or that would go well with the Build I was slowly Crafting to be a better Build.
haha, @dickwad & @kowiz , replace that Ring with a Nadroji Ring. that has a +2 All Sets. with the one on the Choker, you will have +4 All Sets. right now you have 3 Periphery with +2 All Sets with gives you Periphery (5). with the +2 from Nadroji, you will have Periphery (7). 8 is the Cap for Set Affixes, +4 is the Cap for +All Sets. you can get a Nadroji Ring killing Epic+ (Orange, Red, or Purple) monsters on floors past 100 of any difficulty. you will have different affixes than the ones on the Ring you are using, but this is a good learning experience.