Website Banner Design

I want to design professional modern theme based banners. There is a website named gemncarat.com which is not live. The theme of website is black and golden colour. It is an e-commerce website. I want to design light colour theme banners like lifht blue, lifht pink, lifh yellow etc. Some example websites similar to it : http://Brahmagems.com, https://rashiratanbhagya.com/.

Please take reffrence to these websites also.