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Such classes make up color (both body tone and you may play-of-color), directionality from play-of-colour, cut quality, and you will problems (a.k.a. clearness and you can openness). As opposed to the new based levels of well-known jewels such as expensive diamonds, here aren’t authoritative levels to possess opals. Nonetheless, some other vendors and you may industry management have created their own opal levels.