We use standard US sizing. If you already know your US size, please go ahead and order with the same. 

Indian Ring Size to BRIA Jewels Ring Size Guide: [9-10=5] [11-12=6] [13-15=7] [16-18=8/9]

You can also use an app called Ring Sizer which uses the same size chart. or use the methods stated below the size chart. 

SIZE CHART:  

 

If you don't know your ring size, you can measure the inner diameter of your ring to determine your US size from the table below :

       

Alternatively, you can measure your ring size by using a thin paper by wrapping it around the base of the finger to be sized, marking the paper where it completes the circle and measuring the length from the beginning to the marked end with a ruler. This will give you the circumference with which you can determine your US size from the table below.