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  2. 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.

  3. Darry Ring - Wikipedia

    en.wikipedia.org/wiki/Darry_Ring

    Darry Ring, (colloquially known as DR) is a Chinese jewelry brand headquartered in Shenzhen, China, known for its "One Love, One Lifetime" philosophy. Specializing in engagement rings and wedding rings , as well as other fine jewelry, all its diamonds are certified by authorities such as NGTC, GIA, or IGI.

  4. Immersion suit - Wikipedia

    en.wikipedia.org/wiki/Immersion_suit

    An immersion suit, also known as a survival suit, is a type of waterproof dry suit intended to protect the wearer from hypothermia if immersed in cold water or otherwise exposed after abandoning a vessel, especially in the open ocean. Immersion suits usually have integral footwear, and a hood, and either built-in gloves or watertight wrist seals.

  5. Water Resistant mark - Wikipedia

    en.wikipedia.org/wiki/Water_Resistant_mark

    The International Organization for Standardization (ISO) issued a standard for water-resistant watches which also prohibits the term waterproof to be used with watches, which many countries have adopted. This standard was introduced in 1990 as the ISO 2281:1990 and only designed for watches intended for ordinary daily use and are resistant to ...

  6. Class ring - Wikipedia

    en.wikipedia.org/wiki/Class_ring

    A class ring in a ring case. This ring is made of white ultrium and contains a synthetic sapphire gemstone. [1] Damavand College class ring of 1975. In the United States and Canada, a class ring (also known as a graduation, graduate, senior, or grad ring) is a ring worn by students and alumni to commemorate their final academic year and/or graduation, generally for a high school, college, or ...

  7. Mood ring - Wikipedia

    en.wikipedia.org/wiki/Mood_ring

    The original "mood ring" introduced as the Mood Stone in the summer of 1975. A mood ring is a finger ring that contains a thermochromic element, or "mood stone", that changes colors based on the temperature of the finger of the wearer. Finger temperature, as long as the ambient temperature is relatively constant, is significantly determined by ...

  8. Tarnish - Wikipedia

    en.wikipedia.org/wiki/Tarnish

    Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust. Only the top few layers of the ...

  9. Lifebuoy - Wikipedia

    en.wikipedia.org/wiki/Lifebuoy

    Lifebuoy with emergency light on a cruise ship A lifebuoy floating on water. A lifebuoy or life ring, among many other names (see § Other names), is a life-saving buoy designed to be thrown to a person in water to provide buoyancy and prevent drowning. [1] Some modern lifebuoys are fitted with one or more seawater-activated lights to aid ...

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