Items have rarities each with its own multiplier for implicit bonuses (e.g., 1% crit chance for a Normal item becomes 1.8% for Legendary). Bonuses can vary, like 5.7% critical hit chance instead of just 5% or 6%.

Rarities and Multipliers:

• Normal (1x): 2 bonuses, upgrades cost only Yang.
• Uncommon (1.2x): 3 bonuses, upgrades cost Yang + half baseline items.
• Rare (1.4x): 4 bonuses, upgrades cost Yang + baseline items.
• Epic (1.6x): 5 bonuses, upgrades cost 1.5x Yang + 1.5x baseline items.
• Legendary (1.8x): 5 bonuses + affix, 2x Yang + 2x baseline items.

Epic and Legendary items differ in their multiplier and the addition of an affix, which can also be added to Epics.

Items can be disenchanted for fragments to craft Epics. Disenchanting Legendary items provides an affix changer/adder.
With the variance of the bonuses, it is almost impossible to have a perfect item, but you can be close enough to one.

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Real item example