Lab Grown Star Sapphire
$35.00
Item number:
2
Lab Grown Star Sapphire 1.60 CT
Lab-grown star sapphires are synthetic gems that replicate the natural growth process, featuring a unique star-like optical effect called asterism. They possess the same chemical, physical, and optical properties as their mined counterparts (a 9 on the Mohs hardness scale) but are significantly more affordable and uniform in clarity.
The Asterism Effect
The striking 6-ray star in these stones is caused by needle-like rutile inclusions. When light hits these intersecting fibers inside the polished dome (cabochon), it reflects to create the narrow bands of the star. The star will appear to float and move across the stone as the light source shifts.
Popular Growth & Manufacturing Methods
- Verneuil (Flame Fusion) Method: The most common historical and modern process, where powdered alumina is melted and crystallized to form the gem.
- Titanium Diffusion: Often used to enhance the color and bring out sharp, crisp asterism on the surface of synthetic corundum.
- Linde Stars: Vintage synthetic star sapphires produced by Union Carbide between the late 1940s and 1970s. They are highly collectible and can often be identified by a cursive "L" engraved on the base.