O - Ovaltine, after a long night down t'pit? 
The only O--- gemstones I can think of are ones I don't really remember hearing of in Tolkien, like ONYX. OPALS may be mentioned in a song or a necklace somewhere.
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"Sit by the firelight's glow; tell us an old tale we know. Tell of adventures strange and rare; never to change, ever to share! Stories we tell will cast their spell, now and for always."
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