Xavier Exelle | 🇫🇷 French Gem Dealer on Instagram: "Alexandrite is ultra-rare and color-changing. So why don’t high jewelry brands use it? Because it’s impossible to match. Alexandrite has one of the most dramatic color shifts in gemstones. Green in natural light. Red in artificial light. When the shift is perfect, it’s mesmerizing. But « perfect » is the problem. Most alexandrites don’t shift perfectly. The green is weak. The red leans brown. Finding a stone with vivid green and vivid red in