The gemstone ball is made of sapphire/ruby as the material, utilizing the characteristics of corrosion resistance, wear resistance, and good light transmittance of the gemstone material. It is often used in precision measurement, microfluidic valve cores, flow meter ball valves, fiber optic communication, optical lenses, and other fields.
quality grade: G5 

Sapphire Ball Lens & Hemispherical Lens
     Sapphire is ideal material for ball lens because of its excellent transmission bandwidths between the UV and IR at 0.15-5.5µm and high refractive index of 1.75. Ball lens out of sapphire exhibits exceptional performance like mechanical, optical, thermal and chemical robustness.  
Sapphire ball can be made with drilled holes, ground into hemispherical lenses and drum ball lenses. Sapphire ball can be antireflection (AR) coated to minimize reflection for optical applications.
Typical applications of precision sapphire ball include fiber communication, flow meters, rotameters, bar code readers, check valves and laser measurements systems.