A Last Moment's Whisper

This is a very pretty poem; you have some lovely imagery going on here. I loved the first lines in particular:

As if it were some warm, summer afternoon,

golden sun rays enhancing his eyes,

reflected on his beloved’s face.

He could not see her cry,

could not see those sapphires

spoiling their glisten with tears.

These caught my attention, something you always want to do at the beginning of a piece.

Least when they expect it,

This might flow better if you worded it "When they least expect it."

He cannot remember his name,

And she, what a shame!

Obviously these two lines rhyme. The only problem with that is that throughout most of the poem, you seem a little uncertain as to whether you really want the lines to rhyme or not. I'd suggest either eliminating the rhyme altogether, or giving it a steadier pattern.

A bittersweet crime it is to surfeit

Surfeit, nice vocabulary here!

However tight and snug love may be,

This is just a personal opinion, but I don't really favor the use of "snug" here. Maybe a more sophisticated word?

Then last a moment’s whisper

The wording here is a little confusing. You might try replacing "last" with "at last" or "finally" to clear up the meaning a bit.

Overall: I like this poem. It presents emotion without being sappy, and as I said before, your language is beautiful. Keep up the good work!