round London blue topaz stone, aa-grade, choose your size

Stone shape: Round
Stone size: see above
Stone type: Natural
Color: Intense dark blue
Clarity: Clear and bright
Grade: AA
Mohs hardness: 8
Refractive index: 1.619–1.627
Specific gravity: 3.53
Treatment: Irradiated (R) and heat-treated (H)
Country of origin: INDIA