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2. Centenario (coin) - Wikipedia

   en.wikipedia.org/wiki/Centenario_(coin)

   The Centenario is a Mexican gold bullion coin first minted in 1921 to commemorate the 100th anniversary of Mexico's independence from Spain. [1] The coin is not intended to be used as currency; the face value of 50 pesos is for legal purposes only, and does not reflect the actual value of the gold content.

3. Jewellery chain - Wikipedia

   en.wikipedia.org/wiki/Jewellery_chain

   Gold body chain for a slight woman or a girl. Frontal view with an amethyst and four garnets; four other gems are missing (4th or 5th century Romano British, part of the Hoxne hoard) [1] Byzantine body chain found as part of the Asyut Treasure, Egypt c. 600 AD (British Museum) [2] Gold chain from the sixteenth century, Sweden.

4. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   For example, a gold alloy of 127 ⁄ 128 fineness (that is, 99.2% purity) could have been described as being 23-karat, 3-grain, 1-quart gold. The karat fractional system is increasingly being complemented or superseded by the millesimal system, described above for bullion, though jewelry generally tends to still use the karat system.

5. 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.

6. Speidel - Wikipedia

   en.wikipedia.org/wiki/Speidel

   In 1896 he built the company's first factory, installing state-of-the-art machines for the production of gold chain, previously manufactured entirely by hand. [ 3 ] Friedrich Speidel sent his three sons, Albert, Edwin and Eugene to America to establish a branch of the family's jewelry chain manufacturing business. [ 4 ]

7. BIS hallmark - Wikipedia

   en.wikipedia.org/wiki/BIS_hallmark

   The BIS system of hallmarking of gold jewellery began in April 2000. The standard specifications governing this system are IS 1417 (grades of gold and gold alloys, jewellery/artefacts), IS 1418 (assaying of gold in gold bullion, gold alloys and gold jewellery/artefacts), IS 2790 (guidelines for manufacture of 14, 18 and 22 carat gold alloys only ), IS 3095 (gold solders for use in manufacture ...