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2. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   If the gold layer is 12 kt or higher, the minimum layer of karat gold in an item stamped gold-filled marks must equal at least 1 ⁄ 20th the total weight of the item. The most common stamps found on gold-filled jewelry are 1 ⁄ 20th 12kt GF and 1 ⁄ 20th 14kt GF. Also common is 1 ⁄ 10th 10kt. These standards are for modern gold-filled items.

3. How to Spot The Best Vintage Jewelry in Thrift Stores ... - AOL

   www.aol.com/spot-best-vintage-jewelry-thrift...

   The loupe also allows you to read any markings (if any exist) regarding gold and silver quality. For example, 10k, 14k, and 18k mean 10-carat, 14-carat, and 18-carat gold, and 925 indicates ...

4. How to Sell Gold Jewelry When Prices Hit Historic High

   www.aol.com/sell-gold-jewelry-price-nears...

   Find the karat-markings, weigh the items and calculate the melt value. (See chart below). ... An 18K gold piece is about 75 percent pure gold and 10K gold is just more than 41%. So the higher the ...

5. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   For example, knowing that standard 18-carat yellow gold consists of 75% gold, 12.5% silver and the remaining 12.5% of copper (all by mass), the volume of pure gold in this alloy will be 60% since gold is much denser than the other metals used: 19.32 g/cm 3 for gold, 10.49 g/cm 3 for silver and 8.96 g/cm 3 for copper.

6. Black Hills gold jewelry - Wikipedia

   en.wikipedia.org/wiki/Black_Hills_gold_jewelry

   Black Hills gold jewelry depicts leaves, grape clusters and vines, and is made with alloys of gold with standard yellow gold as well as green and pink gold. [ 1 ] [ 2 ] In 1980, the 8th Circuit affirmed an injunction ruling that if a manufacturer was to call its jewelry Black Hills Gold, then it must be made in the Black Hills. [ 3 ]

7. Hallmark - Wikipedia

   en.wikipedia.org/wiki/Hallmark

   Hallmarks are often confused with "trademarks" or "maker's marks". A hallmark is not the mark of a manufacturer to distinguish their products from other manufacturers' products: that is the function of trademarks or makers' marks. To be a true hallmark, it must be the guarantee of an independent body or authority that the contents are as marked.

8. Speidel - Wikipedia

   en.wikipedia.org/wiki/Speidel

   It was originally founded in Germany by Friedrich Speidel in 1867 as a manufacturer of gold and silver chains. The Speidel Chain Company was formed in its modern state in the United States in 1904. It was known for its "Ratchet-buckle" watchbands (introduced in 1920), the "Scissors Action Expansion Band" (introduced in 1936), the ladies ...

9. German mark (1871) - Wikipedia

   en.wikipedia.org/wiki/German_mark_(1871)

   Despite the Vereinsthaler being a silver standard currency, it remained unlimited legal tender for 3 gold marks until it was demonetized in 1908. The South German gulden of 4 ⁄ 7 Vereinsthaler was converted to 1 + 5 ⁄ 7 or 1.71 gold marks. The gold-based Bremen thaler was converted directly to the mark at a rate of 1 Thaler gold = 3 + 9 ...