This ring features a rose-cut antique Saphiret. It is antique glass made in the Czech Republic in the 19th century. The loose stone measures 5mm. It strongly changes color from blue to cocoa brown depending on the light. Due to its age, there may be fine scratches, chips, and air bubbles. Please check the photos. Free size From Wikipedia: Saphiret is the name of a color-changing glass made in the Jablonec region of Bohemia (now the Czech Republic) by the early 1900s. It has a pale lavender-pink color and exhibits blue, green, and brown schiller depending on the angle. The manufacturing process is unknown, and it is no longer produced. Some theories suggest that arsenic and gold were used in the raw materials. It is also known as Vauxhall or Voxall. It is different from vintage Saphireen.