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NOVA | Promotion | Treasures of the Earth: Gems Preview

Their beauty has captivated us for millennia. Their cost can be extraordinary–some are even considered priceless. Precious gems like diamonds, rubies, emeralds, opal, and jade are the ultimate treasures of the earth, and each one is made from a specific–and often torturous–recipe of chemistry, pressure, and heat. The secrets to their sparkle, color, and even strength lie deep inside the gems.

S43 E18 | 0:00:30 | AIRED: 10/2/2016 |
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