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.
Publication Name: Lapidary Journal
Subject: Hobbies and crafts
ISSN: 0023-8457
Year: 1992
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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.
Publication Name: Lapidary Journal
Subject: Hobbies and crafts
ISSN: 0023-8457
Year: 1993
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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.
Publication Name: Lapidary Journal
Subject: Hobbies and crafts
ISSN: 0023-8457
Year: 1998
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