Critical angle is when light inside a gem stops escaping and bounces back, making it sparkle. Diamond's low 24.4 degrees means it traps more light, so it sparkles the most. But "special" is for jewellers, not fathers—a diamond's real angle is the cost per carat! This machine's hum counts every rupee for my daughter's wedding, and 24.4 degrees feels like the steep climb to afford even a small one.
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