It seems like you're describing opals! Opals are indeed fascinating gemstones known for their wide variety of colors and unique play-of-color effects. The most sought-after type of opal is often referred to as "precious opal," which exhibits these vibrant iridescent qualities.
When light hits a precious opal, it can reflect back a spectrum of colors, creating a beautiful display that changes as the stone is moved. This optical phenomenon is due to the unique internal structure of the opal, which diffracts light.
Opals can be found in different forms, including:
- White Opals: Light-colored with a play of color.
- Black Opals: Darker background with vibrant colors; highly sought after.
- Boulder Opals: Contain ironstone or sandstone, showcasing natural patterns.
- Fire Opals: Ranging in color from yellow to orange to red, typically with less play-of-color.
The value of an opal is influenced by factors such as the richness of color, clarity, and the intensity of the play-of-color effect.
If you have more specific questions or need additional information about opals, feel free to ask!
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