Here is a color palette inspired by your request for masculine and dark tones, including a shade similar to Beau Green by Benjamin Moore.

json
{
  "palette_name": "Masculine Elegance",
  "colors": [
    {
      "name": "Charcoal Black",
      "hex_code": "
                            
                            #333333
                        "
    },
    {
      "name": "Beau Green",
      "hex_code": "
                            
                            #A3C6C4
                        "
    },
    {
      "name": "Deep Navy",
      "hex_code": "
                            
                            #001F3F
                        "
    },
    {
      "name": "Army Green",
      "hex_code": "
                            
                            #4B5320
                        "
    },
    {
      "name": "Slate Gray",
      "hex_code": "
                            
                            #708090
                        "
    }
  ]
}

This palette features a combination of deep, rich colors that evoke a sense of strength and sophistication, with Beau Green providing a subtle contrast.

Would you like any further adjustments or additional colors?