Micro-Features of Opal Chart

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32" x 20" (80 x 50 cm)This wall chart contains superbly detailed photomicrographs showing internal features observed in natural, treated, synthetic, and imitation opal. Published i n the Summer 2019 issue with the article by Nathan D. Renfro et al., “Inclusions in Natural, Treated, Synthetic, and Imitation Opal,” Gems & Gemology, Vol. 55, No. 2, pp. 244-245. Usually ships in 3-5 business days. Enter code CHARTS20 to receive 20% off when you purchase 3 or more charts. SKU: 181223 Show more