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Publication
Aqueous calcium and aluminum fluoride with several additional anions, which is most often found in the form of white concretions, consisting of a microgranular aggregate.
Many minerals such as zircon, fluorite and even some garnets can contain significant admixtures of radioactive elements.
The now popular "invisible" setting, which makes it possible to create miniatures from cut gemstones, was first developed and applied by Van Cleef & Arpels in 1933.
The shells can be used as a whole or in the form of jewelry and ornamental material.
All corals consist mainly of calcite or a protein substance (keratin), less often aragonite, and therefore have a low hardness and require careful maintenance. As a result, corals in jewelry can be prone to abrasion and scratching.
