Missing Piece 03 - Diamond puzzle | Adam's Venture 1 : The Search for the Lost Garden

Change the color of the diamonds in the 2 squares to show the progression or calculation result of the diamonds that are horizontal.
For example on the left and right sets - vertical:

gold + gold = gold; gold + red = gold; red + red = red.

The stand opens and the third missing part (3/7) is obtained.