The nine-carat Grand Condé went on public view at the Château de Chantilly on October 17, nearly 100 years after its theft in October 1926. Natural diamond prices are at record lows, according to BeInCrypto; the average 1-carat stone costs $3,898, down 51% from $8,007 in 2021, CNBC reported. Lab-grown stones cost up to 90% less and featured in 61% of engagement rings sold in 2025. The Diamond Standard Index also hit a record low.