Measuring 47 mm in diameter and 14.65 mm in thickness, the Jacob & Co. Brilliant Flying Tourbillon Tsavorites is cased in 18K yellow gold with an invisible gem-set of 170 baguette tsavorites with a total weight of 12.10 carats. Tsavorite is the trade name used to refer for the emerald-green variety of a grossular garnet that comes from Africa. Tsavorite has become one of the most popular and expensive garnets, due to its rarity.