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Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite is more stable and less brittle than marcasite.
Marcasite reacts more readily than pyrite under conditions of high humidity. The product of this disintegration is iron(II) sulfate and sulfuric acid. The hydrous iron sulfate forms a white powder consisting of the mineral melanterite, FeSO 4 ·7H 2 O. [13] This disintegration of marcasite in mineral collections is known as "pyrite decay".
At the time when the term became common in jewelry making, "marcasite" referred to all iron sulfides including pyrite, and not to the orthorhombic FeS 2 mineral marcasite which is lighter in color, brittle and chemically unstable, and thus not suitable for jewelry making. Marcasite jewelry does not actually contain the mineral marcasite. The ...
De Beers tried its hand at growing a lab-grown diamond jewelry business for six years before ditching it earlier this year. But a segment of that failed attempt has flourished—and it has nothing ...
The jewelry creates an economy of gestures for the Swans, the way they move through the world is influenced by it: the removal of an earring to pick up the phone, the movement of an arm to ...
The pieces, named Melis (after the Greek word for honey), were created in the Cartier High Jewelry workshop and are the result of more than 738 hours of work by the maison’s artisans. In keeping ...
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