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💎 Ruby – The red gem variety of corundum (Al₂O₃), coloured by trace amounts of chromium (Cr³⁺). Ruby crystallises in the trigonal system and is prized for its deep red to pinkish-red colour, exceptional hardness (9 on Mohs scale), and vitreous lustre. Corundum without chromium is colourless, while iron and titanium produce blue hues (sapphire). Rubies may exhibit fluorescence under UV light and sometimes show asterism (a six-rayed star) when cut as cabochons due to aligned rutile inclusions. Ru
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