Potential answers for "Gem-grade coal"

⭐⭐⭐⭐ JET
⭐⭐⭐ LIGNITE
⭐⭐ PASSFAIL
⭐ OPAL
⭐ OCTANE
⭐ BOISE
⭐ SOSO
⭐ BINS
⭐ ESSEN
⭐ PTAS

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