Why Sapphire Crystal Matters
Sapphire crystal used in watchmaking is not the gemstone but a lab-grown corundum, ranking just below diamond on the hardness scale.
That hardness means a sapphire crystal resists the everyday scratches from keys, tools, and rough surfaces that would slowly cloud a plastic or mineral-glass crystal over the years.
The trade-off is brittleness — sapphire can chip under a sharp direct impact where softer glass would only scratch — which is why watchmakers pair it with a well-engineered case to absorb shock around the edges.