Boucheron’s forward-thinking Contemplation collection, for example, included an extraordinary necklace that used a mathematical algorithm to suspend diamonds in a cloudlike structure. Contemplation was followed by the maison’s rainbow-inspired Holographique line, influenced by Icelandic-Danish artist Olafur Eliasson and Mexican architect Luis Barragan. A hologram technology pioneered by French aeronautics company Saint-Gobain was used to spray slices of rock crystal with a creative material that makes jewels appear to be changing colour.