Sunstone, 5.748 carats

Technical details: Type: Unknown Sunstone Weight: 5.748 Carats Shape: Cabochon Color: Black Clarity: Uncategorized Transparency: Translucent Hardness: 6.0-6.5 Treatment: Untreated Origin: Unknown Certification: Electronic certificate (PDF) from Saudi Laboratory (MT) - Website (www.mtgl.com.sa) Sunstone is a gemstone belonging to the feldspar group, and is known for a distinctive optical phenomenon called "Aventurescence," where a bright flash or metallic luster appears internally when the stone is moved. This effect is attributed to small inclusions of hematite or goethite minerals or sometimes copper, which reflect light. The color of Sunstone usually ranges between orange, red, gold, or yellow-green, and can be transparent to translucent. This stone forms in igneous and metamorphic rocks.