I think the NASB really misses it on this one. Where the KJV has “grace” (2580) the NASB has “adornment”. This is the only place the NASB translates it this way. It us usually “favor”. This is a familiar term.
(Genesis 6:8 KJV) But Noah found grace (2580) in the eyes of the LORD.The wisdom of Proverbs is not just a bauble that makes your neck look good. It is the favor of Almighty God that helps your neck turn your eyes in the right direction. It is grace that helps you bend a stubborn part of your body in submission to God and in dealing with your fellow man.
So? Wisdom does not make you the smartest kid on the block. Okay, maybe it makes you functionally the most smart, but the purpose is to make you the most righteous you can be. It is not a beauty contest. It is a preparation for eternity. The necklace of grace is more than a sparkly.