CMHL2 is making with chinese freshwater pearls and moissanite pearls and s925 sterling silver gold plated. 
 

CMHL1 is making with chinese freshwater pearls and moissanite pearls and s925 sterling silver gold plated. 
 

CMSD3-2 is making with chinese freshwater pearls and moissanite pearls and s925 sterling silver gold plated. 
 

CMWX39 is made by 14K real gold real moissanite or spinel stones depends on your needs. 
Pearls on this link are using Chinese freshwater pearls. There are few version with different cost in China. Seawater pearls can be selected also but price difference. We are capable to provide 9K/ 10K/ 14K/ 18K real gold as you needs. Contact Lohman for more details please. 

This jewerly set can be made by s925 sterling silver and also 9K Gold. Depends on target price of your market. 
Sterling silver gold plated are nice wormanship as workmanship of real gold. Attaching prices list below for both sterling silver and real gold.