Jewels is everything a George Balanchine admirer could ask for. The sumptuous triptych, set to scores by Fauré, Stravinsky and Tchaikovsky, is a compendium of what Balanchine’s style is about; each part — Emeralds, Rubies and Diamonds — provides unique insights into the subtleties, signature features and inventiveness that inform the art of the Russian master who fathered American ballet.