Tourmaline, alexandrite and sapphire soar Record sale of a 16.53-carat Brazilian alexandrite ring sold at auction for $1.9 million, an unprecedented price for this chameleon-like stone. According to insiders, an impressive but not surprising result, considering the high demand for rare stones that dominated the market in 2024. According to Omi Gems, the year's best results were achieved by alexandrite, ruby and Paraiba tourmaline, paving the way for a 2025 that will be even stronger in terms of color, with the US leading the way. Which stones are most likely to succeed? With green gaining...