Al Biruni, 11th century AD, Kitab al-Jamahir fi Ma‘rifat al-Jawahir writes:
"The prices of jewels are not stable. There is no law governing their prices, and there is no reason why these prices should not fluctuate with time and place. Each country, each nation carries its own temper. Furthermore, at one time nobles begin to sell them off and at others, to stock them. Stones are plentiful at one time and scarce at another. God grants honour to some and disgrace to others."
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