Which Is More Expensive: Opal or Moonstone?

Opal is a mesmerizing gemstone known for its captivating play of color; it is an optical effect that has a wide range of colors. This phenomenon happens due to the diffraction of light as it passes through tiny silica spheres within the gemstone. In contrast, moonstone is identified by its captivating adularescence, a soft glow that appears to billow across the gem as it moves. 

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