to decorate something with jewels; to make something sparkle or shine like it's covered with precious gems.
From 'be-' combined with 'jewel,' from Old French jouel, possibly from Latin jocale (plaything). The prefix 'be-' makes the verb mean 'to cover with' or 'to adorn with.'
The 'be-' prefix originally meant 'around' or 'about,' and in words like 'bejewel,' 'befriend,' and 'bedazzle,' it still keeps that sense—you're surrounding something with jewels, covering it completely, making it totally friend-like. It's a prefix that hasn't lost its meaning, just become old-fashioned.
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