It seems like the platinum heart is smaller than the WG.
Here it says the gold charms are all 16mm:
http://www.tiffany.ca/Shopping/Item...12-c+287465-r+501607567-x+-n+6-ri+-ni+0-t+-k+
While here is says the platinum is .5 inches which converts to 12.7mm:
http://www.tiffany.ca/Shopping/item...p+1-c+287465-r+-x+-n+6-ri+-ni+1-t&mcat=148204
Yet they are both called size small:
http://www.tiffany.ca/Shopping/Item...+-n+6-ri+-ni+0-t+open+heart+charm-k+&search=1
For those of you who have the small size how many mm are yours?
Here it says the gold charms are all 16mm:
http://www.tiffany.ca/Shopping/Item...12-c+287465-r+501607567-x+-n+6-ri+-ni+0-t+-k+
While here is says the platinum is .5 inches which converts to 12.7mm:
http://www.tiffany.ca/Shopping/item...p+1-c+287465-r+-x+-n+6-ri+-ni+1-t&mcat=148204
Yet they are both called size small:
http://www.tiffany.ca/Shopping/Item...+-n+6-ri+-ni+0-t+open+heart+charm-k+&search=1
