Free Ring Sizer Patented Design

Free Ring Sizer

At Brisbane Diamond Company we realise that you may not know the ring size required or how to find out the size accurately. No need to go see your local jeweller, we will provide you with the most accurate patented finger sizer available free of charge - just complete the contact form below and we will have one in the mail to you today, the pack includes your complimentary GIA diamond information kit, to help ensure you are able to accurately understand how the GIA diamond grading system works.

Ring Sizes for men and women in Australia typically range from size A through to size Z4 we use the UK ring sizing system. Information on the European Asian and US ring sizing systems can be found here if required.



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There are several systems for denoting the sizes of jewellery rings in use around the world:

  • The ISO standard for ring sizes is ISO 8653:1986, which defines standard ring sizes in terms of the inner circumference of the ring measured in millimetres.
  • In the United States and Canada, ring sizes are specified using a numerical scale, with quarter and half sizes. An increase of a full size is an increase of 0.032 inch (0.8128 mm) in diameter, or roughly 1/10 inch (more precisely, 0.1005 in or 2.55 mm) in inside circumference.
  • In Ireland, the United Kingdom and Australia,ring sizes are specified using an alphabetical scale, with half sizes.
  • In India, Japan and China, ring sizes are specified using a numerical scale, that only has whole sizes, and does not have simple linear correlation with diameter or circumference.
  • In Austria, France, Germany, Belgium and Scandinavia, ring sizes are specified using actual internal circumference in mm (the same as the ISO standard). In some countries, half sizes may be used.
  • In Italy, Spain, Netherlands, and Switzerland, ring sizes are specified as the circumference minus 40mm. A 50 in Germany will be a 10 in Switzerland.