Rainbow calsilica colourful man-made stone introduced in 2002
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Rhodochrosite mined in north east Argentina since the times of the Incas
Rhodonite often features black markings caused by manganese oxides
Pink variety of the mineral quartz. Individual crystals have never been found
Red corundum is ruby all others colours are classed as sapphire
Ruby zoisite a combination of red corundum and green zoisite
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