Other pieces incorporate ivory, agate, shell, and rock crystal.

BBC: Entertainment & Arts

The 75 objects on display will include antique ornaments made of ivory, shell, and rock crystal along with modern jewelry made of diamonds, emeralds, sapphires, rubies and pearls became fashionable in later years.

FORBES: Boston MFA to Open New Gallery with Jewelry Exhibit

On federal lands, Shell has been researching methods to cook oil out of the shale (basically oil-soaked rock) without mining it or polluting groundwater.

FORBES: OutFront

But now, Shell Oil Company hopes to change all that with a radical new twist: Bring the heat to the rock.

NPR: Industry Seeks to Extract Oil from Rocky Mountain Shale