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https://jewelrybyjohan.com/blogs/jewelry-blog/ultimate-guide-to-black-rings
What is Black Ceramic? Jewelry grade black ceramic is an extremely hard, light weight, non-metallic material that has recently been used extensively in jewelry making. Its black color is NOT a coating. Pros: Scratch resistant. Harder than all metals except solid Tungsten. Won’t corrode or tarnish in salt water or acid. Light weight.
https://www.thesprucecrafts.com/identify-black-materials-victorian-jewelry-149534
Jet, a type of fossilized wood, was perhaps the rarest and most prized black material used to manufacture Victorian jewelry. It is light in weight and soft and warm to the touch. Seen under a loupe, it often has tiny, distinctive fissures or chips that differ from French jet (glass).
https://www.gemselect.com/other-info/scratching-the-surface-of-black-metal-jewelry.php
Oct 16, 2015 · There are several ways in which black metal jewelry can be achieved. For example, a black gold alloy can be made. Black gold alloys are typically made from 25% cobalt to 75% gold, though other alloys exist. Though these are referred to as "alloys", the black color is only a surface layer.
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