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2. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   The Federal Trade Commission allows the use of the terms "rolled gold plate," "R.G.P" or "gold overlay" on items with lower thicknesses of gold than are required for "gold-filled." [ 3 ] An example would be an item stamped as " 1 ⁄ 40 10kt RGP" meaning that the object is plated with 10kt gold at a thickness that makes weight of the plated ...

3. Plug (jewellery) - Wikipedia

   en.wikipedia.org/wiki/Plug_(jewellery)

   A flesh tunnel is a hollow, tube-shaped variety of body piercing jewelry. It is also sometimes referred to as a spool, fleshy, earlet, expander, or eyelet. A flesh tunnel is usually used in stretched or scalpelled piercings. Flesh tunnels are made in smaller gauges. However, the smaller the gauge the smaller the effect to see through the plug ...

4. Livery collar - Wikipedia

   en.wikipedia.org/wiki/Livery_collar

   A livery collar or chain of office is a collar or heavy chain, usually of gold, worn as insignia of office or a mark of fealty or other association in Europe from the Middle Ages onwards. One of the oldest and best-known livery collars is the Collar of Esses , which has been in continuous use in England since the 14th century.

5. Order of the Golden Chains - Wikipedia

   en.wikipedia.org/wiki/Order_of_the_Golden_Chains

   These boys, in order to acquire to the golden chain of the order, had to fight every two years on a knight tournament, single combat "up to life or death" . This courtly ideal, in which knights protecting vulnerable women, was characteristic of the culture and chivalrous self-image of the late Middle Ages .

6. Titanium gold - Wikipedia

   en.wikipedia.org/wiki/Titanium_gold

   In metallurgy, titanium gold (Ti-Au or Au-Ti) refers to an alloy consisting of titanium and gold. Such alloys are used in dentistry , [ 1 ] [ 2 ] ceramics and jewelry . [ 3 ] Like many other alloys, titanium gold alloys have a higher yield strength, tensile strength , hardness , and magnetism than either of its constituent metals.

7. O-ring chain - Wikipedia

   en.wikipedia.org/wiki/O-ring_chain

   O-ring chains are most notably used in motorcycles, one of the most demanding applications for a metal chain. High rpm and heavy loads require bulky chains, but such engineering increases the effect of friction compared to lighter chains. So lubrication plays a vital role here, but the high rpm also makes it very difficult to keep lubrication ...