Freight: 
**weight calculation:
  belly ring are about 0.007kg/pcs. So weight=Quantities*0.007

**Rate of Charges:  
Australian:  USD25 for first 0.5kg, USD6 for following 0.5kg.
USA:         USD22 for first 0.5kg, USD6 for following 0.5kg
European:    USD25 for first 0.5kg, USD6 for following 0.5kg

For examples, clients in USA order 1000pcs of jewelry, So weight is 1000*0.007=7kg
Shipping charges is: 22*1+(7*2-1)*6=$100