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Black opal ring with a dark body tone that can range from dark gray to jet black is called ring type opal. Compared to lighter opals its black base makes the opal vivid hues stand out more dramatically. Bright red, blue, green and purple can all be seen in a black opals play of color which produces an alluring impression late. The 19th century discovery of these opals transformed the gemstone industry and raised awareness of their exceptional beauty and scarcity.