Note that this is a unique ring and the one that will be shipped.

Amazing dendritic agate ring set in sterling silver

Approximate measurements with silver: 24 mm x 17 mm

weight: 5.67 grams

code: 337

RING SIZE CONVERSION CHART LINK:
http://findmyringsize.com/en/conversiontable.aspx

Note that you can find other charts on google