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2. Tungsten - Wikipedia

   en.wikipedia.org/wiki/Tungsten

   The jewelry industry makes rings of sintered tungsten carbide, tungsten carbide/metal composites, and also metallic tungsten. [73] WC/metal composite rings use nickel as the metal matrix in place of cobalt because it takes a higher luster when polished.

3. Wedding ring - Wikipedia

   en.wikipedia.org/wiki/Wedding_ring

   Wedding ring. A wedding ring is commonly worn on the ring finger. A pair of wedding rings. A wedding ring or wedding band is a finger ring that indicates that its wearer is married. [ 1] It is usually forged from metal, traditionally gold or another precious metal. Rings were used in ancient Rome during marriage.

4. Diamond - Wikipedia

   en.wikipedia.org/wiki/Diamond

   Diamond also has a very high refractive index and a relatively high optical dispersion. Most natural diamonds have ages between 1 billion and 3.5 billion years. Most were formed at depths between 150 and 250 kilometres (93 and 155 mi) in the Earth's mantle, although a few have come from as deep as 800 kilometres (500 mi). Under high pressure ...

5. Eternity ring - Wikipedia

   en.wikipedia.org/wiki/Eternity_ring

   The concept of a diamond eternity ring was created in the 1960s by diamond merchant De Beers. [5] [6] American investigative journalist Edward Jay Epstein stated that at the time the company had a secret agreement with the Soviet Union which, in return for the creation of a "single channel" controlling the world's supply of diamonds, required the purchase of 90–95% of the uncut gem diamonds ...

6. Tungsten (band) - Wikipedia

   en.wikipedia.org/wiki/Tungsten_(band)

   Tungsten is a Swedish power metal band formed by ex-HammerFall drummer Anders Johansson and his two sons. History. Anders founded the band in 2016, ...

7. Mohs scale - Wikipedia

   en.wikipedia.org/wiki/Mohs_scale

   Diamond (Mohs 10) is 1500 (off scale). Diamond was the hardest known naturally occurring mineral when the scale was designed, and defines the top of the scale, arbitrarily set at 10. The hardness of a material is measured against the scale by finding the hardest material that the given material can scratch, or the softest material that can ...