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  2. Cubic zirconia - Wikipedia

    en.wikipedia.org/wiki/Cubic_zirconia

    The apparatus used in this process consists of a cup-shaped crucible surrounded by radio frequency-activated (RF-activated) copper coils and a water-cooling system. [3] [13] Zirconium dioxide thoroughly mixed with a stabilizer (normally 10% yttrium oxide) is fed into a cold crucible. Metallic chips of either zirconium or the stabilizer are ...

  3. Moissanite - Wikipedia

    en.wikipedia.org/wiki/Moissanite

    A moissanite engagement ring Moissanite: emerald cut. Moissanite was introduced to the jewelry market as a diamond alternative in 1998 after Charles & Colvard (formerly known as C3 Inc.) received patents to create and market lab-grown silicon carbide gemstones, becoming the first firm to do so. By 2018 all patents on the original process world ...

  4. Noble metal - Wikipedia

    en.wikipedia.org/wiki/Noble_metal

    This broader set includes copper, mercury, technetium, rhenium, arsenic, antimony, bismuth, polonium, gold, the six platinum group metals, and silver. Many of the noble metals are used in alloys for jewelry or coinage. In dentistry, silver is not always considered a noble metal because it is subject to corrosion when present in the mouth.

  5. Engagement ring - Wikipedia

    en.wikipedia.org/wiki/Engagement_ring

    Engagement rings in India are often part of elaborate jewelry sets exchanged during traditional ceremonies. These rings, typically crafted from gold, align with cultural preferences for ornate and symbolic designs. [57] In Japan, engagement rings are known for their minimalist and high-quality designs. This reflects Japan's cultural preference ...

  6. List of copper alloys - Wikipedia

    en.wikipedia.org/wiki/List_of_copper_alloys

    Latten is a further term, mostly used for coins with a very high copper content. Today the term copper alloy tends to be substituted for all of these, especially by museums. [1] Copper deposits are abundant in most parts of the world (globally 70 parts per million), and it has therefore always been a relatively cheap metal.

  7. Titanium ring - Wikipedia

    en.wikipedia.org/wiki/Titanium_ring

    Titanium rings are jewelry rings or bands which have been primarily constructed from titanium. The actual compositions of titanium can vary, such as "commercial pure" (99.2% titanium) or "aircraft grade" (primarily, 90% titanium, 6% aluminum, 4% vanadium), and titanium rings are often crafted in combination with other materials, such as gemstones and traditional jewelry metals.