Your diamond grade is SI grade, and generally it will not be marked with clarity. If the natural inclusions are visible to the naked eye in the sun, it is P grade. The sales price of each brand is different, and the personal estimate is around 2000.
Inspection conclusion: diamond ring
Total mass:1.44g.
Shape: circular faceted shape
Color level: white
Cleanliness: * * * *
Appearance characteristics: main stone 1 hexagonal inlay.
Note: Au750
Weight of marker stone: 0. 123 carats