Part of the Russian crown jewels for centuries, Caesar’s ruby turned out not to be a ruby at all. The raspberry-shaped gem of over 255 carats, which was made into a pendant with gold leaf and green enamel, has a peripatetic history: After the death in 1574 of its first known owner, Charles IX of France , his wife, Elisabeth, took him home to Austria. It was later plundered by Sweden during the Thirty Years’ War and eventually given as a gift to Catherine the Great. But during an inventory of the Russian collection in 1922, mineralogist Aleksandr Fersman made a shocking discovery: Caesar’s Ruby was actually a rubellite tourmaline. Although classified as semi-precious, these tourmalines, which get their color from manganese, are actually rarer than rubies. By blending deep scarlet rubies with tourmalines, which tend to come in soft pink tones, in a pair of rose gold chandelier earrings, Bulgari, the 138-year-old Rome-based luxury brand, has created an explosion of shimmering coral reds that trace the curve of the neck. Caesar’s Ruby captured the world’s attention with its depth of hue; these earrings reflect that heritage in an elegant cascade. Bulgari Tourmaline Blossom earrings, price on request, bulgari.com.