Did you know?
An emerald's inclusions are not flaws to hide but a celebrated signature, poetically called the jardin, the garden. The same specks would lower a diamond's value, yet in an emerald they prove it grew in the earth.
Look through a clear rhomb of Iceland spar calcite and the world doubles, split into twin images by the crystal's double refraction. Some researchers think Norse sailors used this very effect to find the sun through cloud, the so-called sunstone, though the idea remains a debated hypothesis.
