[Not a Bug] Prismatic Eclipse

This is not a bug. Any time an item with sockets refers to sockets, it is referring only to it's own sockets. Prismatic Eclipse gets bonuses based on how many sockets of each colour it has.

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Khalixxa wrote:

Please have a look at the wording on Pillar of the Caged God. It is exactly the same, yet the pillar certainly does not refer to only the Strength, Dexterity and Intelligence on the item.

If Prismatic Eclipse is not "bugged" then the wording isn't being used consistently from item to item.

That has nothing to do with sockets.

Items have sockets, and their stats that refer to sockets refer to their own, consistently.
Items do not have attributes (str/dex/int), characters do. Items can provide bonuses to your attributes for wearing them, but they don't have them themselves.

This is exactly the same as local mods already work - weapons have damage, so "increased damage" on weapons applies to their base damage, as a local mod. Armour doesn't have damage to increase, so "increased damage" on an armour will apply to your damage.

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Khalixxa wrote:

If the item refers to its own sockets by default since players themselves cannot have sockets, then "in this item" is redundant on all the other items.

Which other items are you referring to, specifically? There should not be any using that terminology in this context, and if there are, that's a bug in the stat descriptions.

I'm not sure what you did with the quoting there, but there's a distinct different between an item referring to it's sockets (such Prismatic Ecplise), which are part of it, and and an item referring to gems socketed into it, which are clearly separate items.

Again, items are assumed to be referring to themselves when referring to something that is part of them - sockets on a socketable item, damage on weapons, defences on armour. Items are assumed to be talking in the global sense when talking about things which aren't part of them - gems in sockets, damage on armour, defences on weapons, etc.
There is some ambiguity in weapons dealing with "on-hit" effects, which I'd like to clear up when we have time.

Prismatic Eclipse is referring to it's sockets, the items you've listed are referring to other items (gems).