PARIS — Sunlight turning pear-shaped orange diamonds into a spray of fire around the ear. A tiger’s striped coat turning into a graphic play of shadows, onyx and yellow gems against the skin. An emerald’s garden turns into a mesmerizing maze while curves turn a sapphire cabochon into a deep pool. In the stark sunlight of the Mediterranean coast, every nuance and characteristic comes into view — and that’s exactly what Cartier is betting on for its latest high jewelry collection. Revealed Wednesday in a Provençal castle just outside Saint-Tropez, “Le Chœur des Pierres” takes the four classical precious stones as its starting point and builds a full narrative around what the brand expects will leave no one stone-hearted. You May Also Like “Letting a stone speak is to recognize in it a memory of the world, a beauty shaped by time and imbued with eternity,” said Jacqueline Karachi-Langane, director of high jewelry creation for the French jeweler.…