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Quite an important medival German book, that not only lists but also explains the 'science' of stones to his readers would be Daz Steinbuoch by Volmar.

John Greenfield: "A Sermon on Stones? A Note on Volmar's Daz Steinbuoch", Linguas e Literaturas, 1995.
This introductory explanation seems necessary, for motivation, as the following old German text is not the easiest to read:

Volmar, Hans Lambel, St. Florianus, Heinrich: "Das Steinbuch: Ein altdeutsches Gedicht", G Henninger: Heilbronn, 1877.

Quite an important medival German book, that not only lists but also explains the 'science' of stones to his readers would be Daz Steinbuoch by Volmar.

John Greenfield: "A Sermon on Stones? A Note on Volmar's Daz Steinbuoch", Linguas e Literaturas, 1995.
This introductory explanation seems necessary, for motivation, as the following old German text is not the easiest to read:

Volmar, Hans Lambel, St. Florianus, Heinrich: "Das Steinbuch: Ein altdeutsches Gedicht", G Henninger: Heilbronn, 1877.

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As such theThe most famous Marbode Lapidary was translated, but freely accessible online versions seem hard to findlapidary of the medieval period may be that of Marbodius of Rennes. 

De lapidis ou Liber lapidum, seu De gemmis, De lapidibus (avant 1090), in: Valérie Gontero-Lauze, Sagesses: "Sagesses minérales. Médecine et magie des pierres précieuses au Moyen ÂgeÂge", Éditions Classiques Garnier: Paris, 2010, p151–176.

An older translation of Marbodius poems in the Liber LapidumLiber Lapidum into French are online:

As such the most famous Marbode Lapidary was translated, but freely accessible online versions seem hard to find.

De lapidis ou Liber lapidum, seu De gemmis, De lapidibus (avant 1090), in: Valérie Gontero-Lauze, Sagesses minérales. Médecine et magie des pierres précieuses au Moyen Âge, Éditions Classiques Garnier: Paris, 2010, p151–176.

An older translation of Marbodius poems in the Liber Lapidum into French are online

The most famous lapidary of the medieval period may be that of Marbodius of Rennes. 

De lapidis ou Liber lapidum, seu De gemmis, De lapidibus (avant 1090), in: Valérie Gontero-Lauze: "Sagesses minérales. Médecine et magie des pierres précieuses au Moyen Âge", Éditions Classiques Garnier: Paris, 2010, p151–176.

An older translation of Marbodius poems in the Liber Lapidum into French are online:

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From that an excerpt from the translation concerning diamonds, disregarding the poetic verse:

This stone is useful in the art of magic; It fills the heart with strength and energy; It can dispel tiring dreams, night ghosts, larvae and ghosts; Destroy poison the fatal influence, soothe conflicts and heal dementia: She knows how to avenge us on all our enemies. Put these precious gems on a bracelet, May the goldsmith set them in gold or silver; May this jewel always be placed in the sinister.

From that an excerpt from the translation concerning diamonds, disregarding the poetic verse:

This stone is useful in the art of magic; It fills the heart with strength and energy; It can dispel tiring dreams, night ghosts, larvae and ghosts; Destroy poison the fatal influence, soothe conflicts and heal dementia: She knows how to avenge us on all our enemies. Put these precious gems on a bracelet, May the goldsmith set them in gold or silver; May this jewel always be placed in the sinister.

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