It happened so quickly. One day the grapes were green and the next they were no longer green, but beautiful hues of purple, crimson, and okay, some green. Véraison is a French term, but we have adopted the word into our viticulture language. The official definition of véraison is "change of color of the grape berries." Véraison signifies the change from berry growth to berry ripening . I think the clusters look like a series of rainbows framed in gorgeous green leaves. Take a walk through a vineyard if you can - it is breathtaking. Chantico.