The iPhone 6s is pink gold, and the button is gold, is that okay ???

Hello VovaSnyatyn,

Thank you for posting in the Apple Support Communities. It looks like you have a question about an iPhone 6s Rose Gold, and we'd be happy to help.

Please check out the following link for iPhone 6s specification:

iPhone 6s - Technical Specifications

You can also, contact Apple Support for further assistance.

Get Support

Hope this helps. Kind regards. 

Also if you only just bought it, it may be a used or refurbished phone. They have not been made for some years.