Not only a huge stone (a Verneuil Alexandrite of 17.25 carat!) but a huge stone with a real cute phenomenon… it changes color depending on the light source it is exposed to, like natural day-light, candle-light or neon-light. It changes from something between reddish purple to a blueish violet. Check the movie we made from this ring and the pictures, for every position of the ring we made two pictures, exposing it to another light source.
(Click the picture to read more about this French platinum estate ring)