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The Case of the Nun's Ruby                99
the Amsterdam dealer who lost. He'd taken the gem from an exiled Russian Grand Duchess who hadn't any money to pay him back."
Jacob nodded his head up and down several times, but went away unmoved. When I saw him next he brought out of his pocket a crimson bottle-stopper of no ordinary size, and after pledging me to strict secrecy—confided to me that no king or emperor in the world possessed a finer ruby than that which he then held in his hand. For the time was several months later and poor Jacob was in a mental home where they were treating him very kindly. But he never recovered from the result of his shock when he discovered that he, the infallible Jacob W., had been the victim of his own faulty judgment and that his five-thousand-pound ruby was laboratory born.
There is a footnote to manufactured rubies: manufac­tured alexandrites, which are a variety of chrysoberyl, first discovered in 1833. Alexandrites are found in the Ural Mountains * and were given their name to celebrate the coming-of-age of the young Tsar Alexander II. When faceted and polished they are translucent and lustrous, but they are distinguished from all other gems by the intrigu­ing way in which their blue or dark-green daylight colour changes into raspberry red in artificial light.
1 Alexandrites are also produced in Ceylon, but not such good ones as in the Urals. For a long time the Ceylon gem dealers thought they were green sapphires until a specimen was consigned to London where it was tested by experts. The Ceylon Observer of January nth, 1887, has an account of an alexandrite of immense size, 1876 carats—being a carat for almost every year of the date. Its owner refused 10,000 rupees for it and it was eventually cut into small pieces.