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The study of jewelry maker’s marks is a fascinating subject, steeped in history, culture, and art. Often overlooked due to their intentionally hidden location and diminutive size, the etchings found inscribed on a piece of modern or vintage jewelry offer a window into the “who, what, and where” of the piece – and are well worth a serious look.
From contemporary pieces to antique jewelry, letter markings on gold jewelry, silver, and other metals can offer useful insight on the materials, epoch, and producer of a piece. Silver and gold jewelry markings are commonly known as purity marks, maker’s marks, symbols, or date letters.
This jewelry hallmarks guide can help explain what those tiny etchings actually mean – and how to ensure you’re buying the real thing.
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Jewelry Maker’s Marks: A Brief History
To be considered an antique, a piece of jewelry must be 100 years or older, while vintage jewelry must be more than 20 years old to be classified as such. “Retro” jewelry refers to pieces made during the 1940s and ‘50s and are characterized by the use of large and colorful gemstones.
A Lady’s Italian 18K Bracelet with Rubies. Sold for $3,000 via Alex Cooper (October 2017).
In the United States, the National Gold and Silver Stamping Act of 1906 required jewelers to include an accurate purity mark, which indicates the materials used in a given piece. In 1961, the American government also mandated that jewelry manufacturers include a maker’s mark, which indicates the producer of a piece of jewelry.
Hallmarking in Great Britain has had a long history, dating back to the 14th century. Today’s standards are regulated by the Hallmarking Act of 1973. Any piece of British jewelry made prior to 1999 was required to include what is known as a date letter stamp, a letter corresponding to the year that it was registered with the assay office. Assay offices are official governmental establishments who are tasked to assay, or test, the purity of jewelry metals and in some cases, to hallmark the jewelry.
Jewelry marks in France date back even earlier, with known examples first seen in the 13th century. An important year to know if you’re collecting French antique jewelry is the year 1797, when it was required to have a maker’s mark framed within a lozenge, a diamond-shaped charge that is often placed on the field of a shield.
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Common Jewelry Marks
Gold Purity Marks
Purity marks on gold jewelry will consist of a two-digit number followed by the letter “k,” or a three-digit number. The letter “k” refers to karats, where pure gold is composed of 24 karats (24k). A piece of jewelry with an etching that reads “18k” or “750” indicates that it is made up of 75 percent gold, while a “14k” or “585” mark indicates the metal is constructed with 58.5 percent gold.
Detail of maker’s marks on an Italian 18K yellow and rose gold bracelet, mid 20th century. Sold for $3,000 via Alex Cooper (October 2017).
Jewelry engraved with HGE (Heavy Gold Electroplate), GE (Gold Electroplate), or GF (Gold Filled) may appear to be made of gold, but it is actually fashioned from other materials such as copper and contains only a very small amount of gold.
Silver Purity Marks
Silver purity marks also specify metal content (for reference, sterling silver is 92.5 percent pure silver). Therefore, for sterling silver, look for marks that include “925,” “STERLING,” “STG,” or “STER.” Keep an eye out for metals that are etched with “German Silver” or “Nickel Silver.” These pieces are not made up of any silver at all, but are actually composed of copper, nickel, and zinc. If jewelry is marked with “Vermeil,” it is a piece of sterling silver topped off with gold plating.
Detail of markings on a pair of Sterling Silver, 18KT Gold, and Amethyst Earrings, Tiffany & Co. Sold for $475 via Leland Little Auctions Hawkes learning systems for mac. (December 2018).
When considering platinum jewelry, the purity mark “950” denotes a composition of 95 percent platinum with a mix of other metal alloys, while “900” is made up of 90 percent platinum, and “850” has 85 percent platinum.
Maker’s Marks
Maker’s marks may include logos, trademarks, company names, and designer signatures to specify who made the jewelry. Iconic jewelry maker Tiffany & Co., for example, has featured several maker’s marks throughout their 179-year history, including “Tiffany & Co.” and “T & Co.” Special edition Tiffany & Co. jewelry collections created by designers Frank Gehry, Paloma Picasso, Jean Schlumberger, and Elsa Peretti also bear their respective designers’ signatures.
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With antique and vintage pieces, French jeweler and watchmaker Cartier adhered to several guidelines set forth by the French government. Modern Cartier jewelry is always engraved with the Cartier logo, along with a serial number unique to each individual piece.
A Van Cleef & Arpels Diamond Wave Ring in 18K (detail). Sold for $1,500 via Alex Cooper (November 2016).
Van Cleef & Arpels jewelry will also include a serial number accompanying the brand trademark. Depending on the era of the piece, the maker’s mark either reads “Van Cleef & Arpels” or the letters “VCA.”
Other Symbols Stamped on Jewelry
Aside from purity and maker’s marks, some jewelry will also bear symbols and letters, particularly hallmarks, inscribed on it. Broksonic tv owners manual. Many of these symbols and letters found on jewelry originate from assay offices.
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Jewelry from the United Kingdom contains a series of compulsory and optional jewelry marks set out by the countries’ assay offices. One of the compulsory marks is the Assay Office Mark, a symbol which indicates the regional office that hallmarked the item. Assay Office Mark symbols include an anchor that signifies Birmingham, a castle for Edinburgh, a leopard’s head for London, and a rose for Sheffield.
Detail of jewelry markings on a Bulgari “Parentesi” Diamond Necklace, offered via Fortuna Auction (September 2018).
“International, particularly European, jewelry typically has hallmarks, while American jewelry is usually stamped 14k or 18k,” says Virginia Salem, head of the jewelry and watches department at Freeman’s. “Hallmarks tell the story of the piece, and usually what country the item came from, as well as the artist and date made.”
The date letter stamp, a requirement for British jewelry until 1999, is useful to know if you need to date a piece of vintage or retro jewelry. Silver pieces imprinted with a lion denotes 92.5 percent silver — thus sterling silver — while the Britannia mark means that it has 95.8 percent pure silver.
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Starting in 1838, an eagle’s head stamped on a piece of gold jewelry indicated that the jewelry was from France and that it had a minimum of 18k gold. Additionally, a boar’s head was the mark of the Paris assay office, while offices outside the capital city used a crab emblem.
Tips for Avoiding Counterfeit Jewelry
Since gold, silver, and branded jewelry are highly sought-after, encountering fake jewelry is always a risk that collectors need to keep in mind. If you’re purchasing jewelry online, always ask for clear pictures of the jewelry marks from the seller to ensure the authenticity of a piece.
Auction houses and jewelry dealers in particular are important resources for learning more about jewelry maker’s marks. Prior to bidding online or in-person, you can request additional information from jewelry specialists should you have any questions or concerns. When bidding at auction on Invaluable, for example, an easy way to connect to specialists is to use the “Request more information” button located on the product page. The same option exists if you’re considering a purchase from an Invaluable dealer or gallery.
The best way to safeguard against buying imitation jewelry is to familiarize yourself with the most important jewelry marks and signature hallmarks of specific brands. While there are countless jewelry marks to know, additional resources for collectors include the Birmingham Assay Office. Salem adds that Lang Jewelry University, which is well documented and covers a wide range of estate jewelry, is also an excellent reference guide for further detail about specific markings.
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