I have no idea what, "a diamond on the finger of each moment" is supposed to mean. - It hangs there at the end of the poem like a glitzy zircon, and unfortunately it's surrounded by too much of the same in the sestet - all that silk and gossamer and "fresh silence" is a bit much. The poem starts well in the octave, and I was intrigued, but my sense is that by the time the writer got to the sestet there was no sense of direction emerging from the poem, and the sestet seems thrown in there - pretty, but shallow - to get to fourteen.
On a minor technical point, the poem migrates from perfect rhymes - and good rhymes, not cliches - in the octave to slants in the last two rhymes, ending on a weak feminine slant. I normally prefer working in the other direction, and ending sonnets on a perfect masculine rhyme, unless there is a real reason for the weaker ending - and I'm not sure there is here.
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