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http://jewellery.org.ua/stones-katalog-engl/mineral-turmalin.htm
Any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery.Estimated Reading Time: 6 mins
https://www.gemsociety.org/article/hardness-and-wearability/
In most cases, the hardness range reported is very small (one unit). Gemstone hardness may vary a bit within a species. However, kyanite is unusual in that its hardness may vary tremendously, from 4 to 7.5, within a single crystal. Faceters rarely cut this stone.
https://www.firemountaingems.com/resources/jewelry-making-articles/ha57
A Brief, Painless Introduction to Nature's Hard Stuff Minerals, rocks, gemstones, crystals: unless you are a professional or amateur geologist--or maybe earned a merit badge studying them as a scout--you probably will have a hard time explaining the differences amongst these four hard substances found in …
https://snippets.com/what-minerals-are-used-for-jewelry.htm
One of the most popular minerals used in jewelry are the quartz based gems. Amethyst, citrine, rose quartz, agate, smokey quarts and even clear rock crystal are extensively used. Quartz is a very hard and durable mineral and comes in a wide variety of colors and patterns making it perfect for use in jewelry.
https://www.eternaltools.com/blog/15-materials-used-for-jewellery-making
Gold is one of the finest metals used for jewellery – traditionally the choice for wedding bands. Gold is one of the most malleable (easily squashed) and ductile (easily stretched) metals, making it easy to work with. Gold is resistant to most acids.
https://www.leaf.tv/articles/what-is-a-mineral-glass-crystal/
Mineral glass is a common glass and used in the manufacturing of windows and watch faces. Mineral glass is used in place of sapphire in watchmaking because it is more affordable. It can be very hard to tell the difference between mineral glass and sapphire; one sure way is to perform a scratch test.
https://fashionhance.com/common-metals-used-in-jewelry-making
Tungsten carbide, a compound of tungsten and carbon, is used to make jewelry. It is a very hard metal and can be scratched only by diamond. An advantage of tungsten jewelry is that it is hypoallergenic. But, there are limited jewelry options in tungsten, restricting its popularity.
https://www.rocksandminerals4u.com/minerals.html
Garnet Garnet is a group of silicate minerals with six distinct varieties. It is widely used in jewelry making and as an industrial abrasive. The chemical formula is X 3 Y 2 Si 3 O 12. The Mica Group is the name given to a group of silicate minerals that have silicon and oxygen as their two major components.
https://www.thesprucecrafts.com/identify-black-materials-victorian-jewelry-149534
Aug 26, 2020 · Black became big during the 1800s both as a fashion statement and as mourning jewelry, a term referencing pieces deemed appropriate to wear during the long period of tribute to a dearly departed relative.Jewelers used many different black substances to create these pieces and often they're hard to distinguish, especially as some were developed deliberately to imitate rare natural …
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