Source: https://www.swarovski.com/medias/SIZEGUIDE-A4.pdf?context=bWFzdGVyfFNpemVHdWlkZVBERnwxNjQwNjk0fGFwcGxpY2F0aW9uL3BkZnxoNzkvaGIxLzg4NzAyOTExNzc1MDIucGRmfDc1ODg2Yzg1OTYxZjUxZGYxOGRiY2NlM2MwZjYwNDNhMWI1ZmM2NDcyYmQ5MDc3NjQxOTU3N2YxM2QzZjdmNTM