Pineapples & fossils

Article Abstract:

'Pineapples' are opals formed around fossils, found principally in White Cliffs, Australia. In the early days of rockhounding, they were cut up for their gem value and only a few landed in museums. Pineapples are now a rarity and, when one is found, it is priced high above its potential gem value.

Australia, Antiquities, Fossils, Collections and collecting, Opals

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Diffusion detective

Article Abstract:

Heat treated corundum gems such as sapphires suffer color changes and become less valuable. Fortunately, devices such as the Hanneman Mini-Cube II, Immersion Cell and other devices are available for the proper identification of color-diffused sapphires.

Sapphires, Heat treatment (Gems)

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Woman of the millennium: nine hundred years after her birth, Hildegard von Bingen's words on the natural world still resonate

Article Abstract:

Hildegard von Bingen is considered an ideal candidate for the outstanding woman of the 12th century. Hildegard, a poet, scientist, painter, composer, and a lot more, also expressed a profound interest about gemstones and their healing powers.

Behavior, Poets, Hildegard, Saint, Saint

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