• WordNet 3.6
    • adj diamantine consisting of diamonds or resembling diamonds
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Webster's Revised Unabridged Dictionary
    • a Diamantine Adamantine.
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Century Dictionary and Cyclopedia
    • diamantine Adamantine.
    • n diamantine A trade-name for boron in the crystallized state and in fine powder, used as an extremely hard abrasive and polishing material.
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In literature:

The polishing is effected by means of diamantine and alcohol.
"A Treatise on Staff Making and Pivoting" by Eugene E. Hall
Ludwig slashes a la Nietzsche, though he cannot boast that poet's diamantine style.
"Unicorns" by James Huneker