Black Star Sapphire, approx. 16 × 13 × 6 mm, from Malawi – 1 piece
This black Star Sapphire from Malawi measures approx. 16 × 13 × 6 mm and presents itself in an oval cabochon cut with a smooth, highly polished surface. The stone shows a dark, almost black base color with subtle gray and greenish tones, intersected by natural internal structures. Under suitable lighting, the typical star effect (asterism) can become visible, caused by fine needle-like inclusions within the stone. The domed upper side enhances this optical effect, while the underside is ground to a flat surface but not polished, giving it a matte appearance and making it suitable for secure placement or setting. The overall appearance combines a deep, elegant color with a characteristic optical phenomenon that makes this specimen particularly attractive.
Geology & origin
Star Sapphire is a variety of the mineral corundum (aluminum oxide) and owes its star effect to oriented inclusions, typically rutile needles, which reflect light in a star-shaped pattern. With a Mohs hardness of 9, Sapphire is one of the hardest natural minerals and is highly valued for both jewelry and collecting. Malawi is known for producing various corundum varieties, including darker Sapphires with distinct internal structures. This specimen reflects the typical properties of Star Sapphire in a polished cabochon form.
Application note
The stone is suitable, among other things, for jewelry making such as rings or pendants, especially where the star effect can be highlighted under direct light. It is also well suited as a collector’s piece. Due to its hardness, Sapphire is durable, but it should still be protected from strong impacts. For cleaning, lukewarm water and a soft cloth are recommended. Picture shows sample! Item may differ in size, shape and colour from the sample images.