Natural emerald | |
J. Czochralski’s crystal pulling method became popular in the 1910s as an effective method to create durable gemstones. The method involves these steps:Radio waves melt aluminum oxide (Al2O3) in a special container,Dip a rod with a yellow sapphire crystal element at its tip into the aluminum oxide mixture,Slowly rotate and pull out the rod with its gemmed tip to form a ‘pulled’ column of sapphire  | |
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