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There are several items that can't be combined with the golden apple. Applying them will remove the golden apple coat from your horse.
These items are
* Vintage Apple
* Iris' Coat
* Button plaiting
* 5th element
* Custom clip
* Tail braid
* any other custom coat like parade apple, wanderers spirit, hiking journal, ...

Some of these will replace the golden apples coat with another complete coat, so you still won't be able to see your horse (if this is why you're asking) as it usually looks like. I'd suggest using button plaiting, custom clip or tail braid, since they don't change that much of the appearance.

However, you won't get the golden apple back, if that's what you hope for. It will be lost. There is no way to get it back to your inventory.