The 40th anniversary is called the ruby anniversary, and many of the gifts given to celebrate it, both traditional and contemporary, as well as its symbols employ the ruby in some way. The symbolism behind the ruby itself rests in its inner flame that represents a living and vibrant love.
The gemstone representing the 40th anniversary is, of course, the ruby, the color is red, and the flower is the nasturtium. Parties for this particular anniversary frequently carry out a red theme with tablecloths and table accessories, balloons and candles in ruby red. Other anniversaries with well-known names are the silver anniversary for 25 years, the golden anniversary for 50 years, and the diamond anniversary of 75 years.