These brand charts are for traditional gold/diamond jewelry. Fashion or stainless-steel rings sold in India often print the raw diameter in millimeters as the 'size' (e.g. size 18 = 18mm) instead — check which convention your specific ring or listing uses before ordering.
Numeric size (e.g. 8) for US/Canada, EU, or Japan — or a letter size (e.g. P 1/2) for UK/Australia.
Measure the inside diameter of the ring — straight across the inner hole, not the outside of the band.
Lay the ring flat and measure straight across the inside edge.
Wrap a strip of paper or string snugly around your finger, mark where it overlaps, then measure that length — that's your circumference.
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