This product is a rare natural AAA blue Tanzanite oval cut gemstone sourced from Tanzania. The gemstone measures 12x10 mm in length and width, with a depth of 5.9 mm. It is of excellent cut grade with a slightly included clarity grade. The certification is available on demand. Tanzanite is a beautiful and valuable gemstone known for its vibrant blue color, making it a popular choice for jewelry and watchmaking applications.