Color Palette for Birthday Card for 40s Woman:

1. Rose Gold
   - Hex Code: 
                            
                            #B76E79
                        
   - Description: A soft and elegant shade of pink with a touch of warmth, perfect for a sophisticated and feminine birthday card.

2. Lavender
   - Hex Code: 
                            
                            #A595C1
                        
   - Description: A delicate and calming shade of purple, representing grace and femininity, ideal for a birthday card for a woman in her 40s.

3. Champagne
   - Hex Code: 
                            
                            #F6E8D7
                        
   - Description: A light and creamy shade of beige with a hint of gold, symbolizing celebration and elegance, suitable for a milestone birthday card.

4. Coral
   - Hex Code: 
                            
                            #FF7F50
                        
   - Description: A vibrant and cheerful shade of orange-pink, representing energy and vitality, adding a playful touch to the birthday card design.

5. Dusty Blue
   - Hex Code: 
                            
                            #849BB0
                        
   - Description: A soft and muted shade of blue with a hint of gray, evoking a sense of nostalgia and tranquility, perfect for a 40s birthday card.

6. Mauve
   - Hex Code: 
                            
                            #C8A2C8
                        
   - Description: A gentle and muted shade of purple with a touch of gray, symbolizing maturity and sophistication, adding depth to the birthday card design.

This color palette combines feminine shades with a touch of warmth and elegance, capturing the essence of a birthday card for a woman in her 40s.