Firooz Nishaburi Iranian, 40.638 carats

Technical details: Type: Firooz Nishaburi Iranian (Turquoise) Weight: 40.638 carats Shape: Cabochon Color: Persian sky blue Clarity: Unclassified Transparency: Opaque Hardness: 5.0-6.0 Treatment: Untreated Origin: Nishaburi Iranian Certification: Electronic certificate (PDF) from Saudi Laboratory (MT) - website (www.mtgl.com.sa) The turquoise is characterized by its bright and pure sky blue color, which is often free of impurities or brown/black veins (known as "matrix"), or may contain few thin veins of iron oxide or limonite that enhance its beauty. It is known for its good hardness and ability to retain its distinctive blue color for long periods.