2. Jewelry selection Choose high-end jewelry. Choosing jewelry with many attributes is very helpful for synthesis.
The bottom material doesn't matter, because it is fixed.
4. Your own level. The higher the better.
Finally, there is RP, I can't say. When ilvls 1-30, there is a 40% probability of getting 1 affix, and the probability of getting 2, 3 and 4 affixes is 20%.
When ilvls 3 1-50, there is a 60% probability of getting two affixes and a 20% probability of getting three or four affixes.
When ilvls 5 1-70, the probability of getting three affixes is 80%, and the probability of getting four affixes is 20%.
When ilvls 7 1+, there is a probability of 100% to get four affixes.
The basis for calculating the affix level is the level of the item. The ilvl of the composite item is equal to half of your character level (rounded to an integer) plus half of the ilvl of the item you put in (rounded to an integer).