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https://www.jewelryshoppingguide.com/black-hematite-gemstone-guide/
Hematite is typically black to gray in color when it is polished. However, as we mentioned above, in certain other forms, hematite is a rust-red color. In the use of jewelry, it is blackish gray with a metallic luster. Hematite is black-gray with a sharp luster. See this gorgeous necklace here.
https://www.ehow.com/how_5914161_clean-hematite-jewelry.html
Hematite, a form of iron ore, is a semiprecious stone that registers between 5.5 and 6.5 on the hardness scale. Because of this fact, the surface can develop a stain that looks like rust. It is a good idea to clean your hematite stones to prevent this stain from appearing. Hematite jewelry needs to be cleaned to remove oils, makeup, hairspray and pollutants from the air.
https://www.gemsociety.org/article/hematite-jewelry-and-gemstone-information/
Although reasonably tough with a hardness between 5 and 6.5, hematites are also brittle. Avoid mechanical cleaning such as steam or ultrasonic processes. Instead, use a soft brush, mild detergent, and warm water for cleaning. Consult our gemstone jewelry cleaning guide for more recommendations.
http://www.andramada.com/HematiteFAQ.html
To keep from building up chemical residues that may also cause damage, don’t put on perfume, hairspray, makeup or other lotions AFTER you have put on your jewelry as this can put chemical residues onto the stones. Since hematite is in the middle of the hardness scale, it can be scratched, "dinged" and broken by mishandling.
https://rocktumbler.com/blog/the-properties-of-hematite/
Natural hematite is occasionally seen with an iridescent tarnish - so everything hematite and iridescent is not a man-made substance. Properties of Hematite (luster) Hematite is a mineral that occurs naturally with a variety of different lusters.
https://www.annabeck.com/pages/jewelry-care
Due to nature’s elements, 18k gold plated and sterling silver jewelry can fade or tarnish over time. We sell an affordable, convenient two-piece jewelry cleaning cloth to keep your jewelry looking new. Use the interior cloth to remove tarnish without scratching, and then follow up with the exterior cloth to restore that beautiful shine.
https://answers.yahoo.com/question/index?qid=20090218033042AAZ0Tvp
Feb 18, 2009 · If your hematite jewelry needs a cleaning, use either a polishing cloth or liquid tarnish remover if it's with tarnished sterling. Due to its delicate nature, the mineral is found only in precious...
https://en.wikipedia.org/wiki/Hematite
Hematite, also spelled as haematite, is a common iron oxide with a formula of Fe 2 O 3 and is widespread in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3.It has the same crystal structure as corundum (Al 2 O 3) and ilmenite (FeTiO 3), with which it forms a complete solid solution at temperatures above 950 °C ...
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