Peruvian Blue Opal plain rondelle beads have a waxy luster, exhibit good polish, show fairly symmetrical shape, have good depth of blue color, and are varied throughout the strand. These Blue Opalina exhibit white, tan, and ultramarine blue hues in semi-translucent to opaque quality mined only from the Andes Mountains,Peru and are richly blue due to their natural Copper mineral content. A grade