Here’s the updated color palette with a Rusty Gold color added. The hex code for rusty gold is typically #B86A3E . Here’s the revised palette:

{
  "palette_name": "Sweet and Vibrant",
  "colors": [
    {
      "name": "Vanilla Cream",
      "hex_code": "
                            
                            #F8E8D6
                        "
    },
    {
      "name": "Buttered Biscuit",
      "hex_code": "
                            
                            #E4C5A6
                        "
    },
    {
      "name": "Spiced Cocoa",
      "hex_code": "
                            
                            #C08A7E
                        "
    },
    {
      "name": "Mocha Drizzle",
      "hex_code": "
                            
                            #8E6253
                        "
    },
    {
      "name": "Pistachio Whip",
      "hex_code": "
                            
                            #A5C49D
                        "
    },
    {
      "name": "Berry Coulis",
      "hex_code": "
                            
                            #DA5C7A
                        "
    },
    {
      "name": "Vibrant Teal",
      "hex_code": "
                            
                            #008080
                        "
    },
    {
      "name": "Honeycomb Bliss",
      "hex_code": "
                            
                            #F4D988
                        "
    },
    {
      "name": "Rusty Gold",
      "hex_code": "
                            
                            #B86A3E
                        "
    }
  ]
}

This palette now includes a warm, rustic gold hue that complements the existing colors beautifully. If you have any further adjustments or requests, feel free to let me know!