In plain words
The Self is stainless, yet through its closeness to the five sheaths and the rest it seems to take on the nature of each in turn, as a clear crystal seems blue beside a blue cloth. It is the reality that nothing sticks to.
Word for word
Although the Self is stainless and unattached, through association with the five sheaths and the rest it seems to take on their nature, just as a pure crystal [seems coloured] through proximity to blue cloth and similar things.