This rare noun appears in Job 28:17, where wisdom is compared to precious materials—even gold and glass cannot equal it. The term likely refers to glass or crystal, a luxury item in the ancient world. Manufactured glass was rare and valuable, imported from Egypt or Phoenicia. By declaring that wisdom surpasses even such costly materials, Job 28 emphasizes wisdom's transcendent worth. The pairing with gold establishes a hierarchy: precious metals, rare glass, yet wisdom remains beyond price.