Here is a color palette designed for a professional look, suitable for various applications including a pie chart:

json
{
  "palette_name": "Professional 9 Color Palette",
  "colors": [
    {
      "name": "Navy Blue",
      "hex_code": "
          
          #001F3F
       "
    },
    {
      "name": "Slate Gray",
      "hex_code": "
          
          #708090
       "
    },
    {
      "name": "Steel Blue",
      "hex_code": "
          
          #4682B4
       "
    },
    {
      "name": "Dark Olive Green",
      "hex_code": "
          
          #556B2F
       "
    },
    {
      "name": "Crimson",
      "hex_code": "
          
          #DC143C
       "
    },
    {
      "name": "Golden Rod",
      "hex_code": "
          
          #DAA520
       "
    },
    {
      "name": "Medium Slate Blue",
      "hex_code": "
          
          #7B68EE
       "
    },
    {
      "name": "Light Slate Gray",
      "hex_code": "
          
          #778899
       "
    },
    {
      "name": "Dim Gray",
      "hex_code": "
          
          #696969
       "
    }
  ]
}

This palette provides a sophisticated selection of colors that convey professionalism and can enhance the visual appeal of your pie chart.

Would you like to explore more colors or perhaps specific combinations for your design?