{"id":2998,"date":"2014-09-09T08:31:15","date_gmt":"2014-09-09T12:31:15","guid":{"rendered":"http:\/\/admin.acceleratingscience.com\/?p=2998"},"modified":"2026-04-16T20:20:57","modified_gmt":"2026-04-16T20:20:57","slug":"is-xrf-good-enough-for-the-numismatic-profession","status":"publish","type":"post","link":"https:\/\/www.thermofisher.com\/blog\/metals\/is-xrf-good-enough-for-the-numismatic-profession\/","title":{"rendered":"Is XRF Good Enough For The Numismatic Profession?"},"content":{"rendered":"

My last article<\/a> pointed out that industry shifts in the numismatics industry (as a result of counterfeiting) point to an increasing need for highly sophisticated analytical technologies to verify the precious metal content of numismatics.<\/p>\n

Examining the overall presentation of the coin with a loupe or magnifying glass, noting the mint year, surface alterations, special marks, and visible damages will help decide about the general condition and authenticity.\u00a0 Ping tests, electrical conductivity devices, and acid tests have played a role in determining precious metal content and karat value but they all have their limitations.\u00a0 With the rise of fake coins being found in the marketplace, better analysis is needed.<\/p>\n

\u201cFire assay\u201d is the oldest known method of assaying gold and is very accurate.\u00a0 However, the gold must be destroyed\/melted down to be analyzed.\u00a0 That\u2019s the last thing you want to happen to your collectible coins, so you should stay away from that method.<\/p>\n

XRF Can Be Used to Determine the Chemical Composition of Materials\u00a0<\/span><\/p>\n

A widely used technology — that is non-destructive — for analyzing and verifying precious metal content is X-ray fluorescence<\/a> (XRF). X-ray fluorescence (XRF) is an analytical technique used to determine the chemical composition of materials.<\/p>\n

XRF occurs when a fluorescent (or secondary) x-ray is emitted from a sample that is being excited by a primary x-ray source. These x-rays are typically emitted from a miniaturized x-ray tube.\u00a0Each of the elements present in a sample produces a unique set of characteristic x-rays that is a “fingerprint” for that specific element.\u00a0 XRF analyzers<\/a> determine the chemistry of a sample by measuring the spectrum of the characteristic x-ray emitted by the different elements in the sample when it is illuminated by x-rays.\u00a0 Because this fluorescence is unique to the elemental composition of the sample, XRF is an excellent technology for qualitative and quantitative analysis of the material composition.<\/p>\n

XRF quickly provides the exact percentages of all elements within an item \u2013 easily identifying non-standard, under-karated, and even sophisticated counterfeit precious metals that acid testing is incapable of differentiating.<\/p>\n

XRF vs Fire Assay Results<\/span><\/p>\n

We recently tested some samples to find the gold content.\u00a0 Here is a comparison of XRF to fire assay.\u00a0 As you can see by the chart below, XRF analysis shows a very high correlation with the fire assay method. And most importantly, XRF analyzers<\/a> won\u2019t destroy the coin.<\/p>\n

\"\"<\/p>\n

To get more information about these methods and results, including how X-ray fluorescence (XRF) can aid in assessing the value of collectible coins, read the Adding Value to the Numismatic Profession application note<\/a>.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

My last article pointed out that industry shifts in the numismatics industry (as a result of counterfeiting) point to an increasing need for highly sophisticated analytical technologies to verify the precious metal content of numismatics. Examining the overall presentation of the coin with a loupe or magnifying glass, noting the mint year, surface alterations, special<\/p>\n","protected":false},"author":40,"featured_media":3084,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5],"tags":[],"division":[],"class_list":{"0":"post-2998","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-precious-metals","8":"entry"},"_selected_authors":[1206],"_selected_reviewers":[],"acf":[],"yoast_head":"\nXRF vs Fire Assay in the Numismatic Profession<\/title>\n<meta name=\"description\" content=\"XRF analysis shows a very high correlation with the fire assay method. 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For jewelers, cash-for-gold operators, and pawn shop owners, the ability to accurately verify gold authenticity and\u2026","rel":"","context":"In "General\/Industry"","block_context":{"text":"General\/Industry","link":"https:\/\/admin.acceleratingscience.com\/metals\/general-industry-metals\/"},"img":{"alt_text":"Clasp on a 14k Gold necklace with markings on a black background","src":"https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/04\/iStock-1133424222_14k-scaled.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/04\/iStock-1133424222_14k-scaled.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/04\/iStock-1133424222_14k-scaled.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/04\/iStock-1133424222_14k-scaled.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/04\/iStock-1133424222_14k-scaled.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/04\/iStock-1133424222_14k-scaled.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":12889,"url":"https:\/\/www.thermofisher.com\/blog\/metals\/diwali-sparks-gold-buying-frenzy\/","url_meta":{"origin":2998,"position":2},"title":"Diwali Sparks Gold-Buying Frenzy","author":"Marlene Gasdia-Cochrane","date":"October 28, 2025","format":false,"excerpt":"Forty tons of gold, worth $11 billion, was purchased by India in the first two days of Diwali. About 8,000 miles away in New York City, there was a gold buying rush and a cash-for-gold frenzy. Buyers and sellers are banking on the hope that the gold in the pieces\u2026","rel":"","context":"In "Precious Metals"","block_context":{"text":"Precious Metals","link":"https:\/\/admin.acceleratingscience.com\/metals\/precious-metals\/"},"img":{"alt_text":"Diwali Puja Thali With Flowers, Diya, And Gifts","src":"https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2025\/10\/iStock-2240362443-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2025\/10\/iStock-2240362443-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2025\/10\/iStock-2240362443-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2025\/10\/iStock-2240362443-1.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2025\/10\/iStock-2240362443-1.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2025\/10\/iStock-2240362443-1.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":13584,"url":"https:\/\/www.thermofisher.com\/blog\/metals\/why-fall-jewelry-trade-shows-matter-for-holiday-inventory-planning\/","url_meta":{"origin":2998,"position":3},"title":"Why Fall Jewelry Trade Shows Matter for Holiday Inventory Planning","author":"Marlene Gasdia-Cochrane","date":"October 13, 2026","format":false,"excerpt":"Introduction Fall is a critical inventory-planning period for jewelry retailers, wholesalers, designers, and professional buyers. A major trade-only jewelry event taking place October 16\u201319, 2026, in Miami Beach, Florida, is JIS Fall, which gives industry professionals an opportunity to replenish inventory, discover jewelry trends, explore gold analysis technology, and connect\u2026","rel":"","context":"In "General\/Industry"","block_context":{"text":"General\/Industry","link":"https:\/\/admin.acceleratingscience.com\/metals\/general-industry-metals\/"},"img":{"alt_text":"Golden chain hanging on a black frame with bokeh lights and expo blur, matching VIP access, premium presentation, and business event concepts","src":"https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-2265657012_goldshow.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-2265657012_goldshow.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-2265657012_goldshow.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-2265657012_goldshow.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-2265657012_goldshow.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-2265657012_goldshow.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":13857,"url":"https:\/\/www.thermofisher.com\/blog\/metals\/eight-reasons-jewelers-should-not-use-acid-to-test-jewelry\/","url_meta":{"origin":2998,"position":4},"title":"Eight Reasons Jewelers Should NOT Use Acid to Test Jewelry","author":"Marlene Gasdia-Cochrane","date":"October 16, 2026","format":false,"excerpt":"Introduction Traditional acid testing can provide a useful initial indication of precious metal purity, but authoritative sources recognize its limitations when more precise analysis is needed. The Convention on the Control and Marking of Articles of Precious Metals describes touch acid testing as providing a \u201cgood early indication of fineness\u2026","rel":"","context":"In "Precious Metals"","block_context":{"text":"Precious Metals","link":"https:\/\/admin.acceleratingscience.com\/metals\/precious-metals\/"},"img":{"alt_text":"Jeweller's workshop","src":"https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-1062676800_jewelryacid.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-1062676800_jewelryacid.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-1062676800_jewelryacid.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-1062676800_jewelryacid.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-1062676800_jewelryacid.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/admin.acceleratingscience.com\/metals\/wp-content\/uploads\/sites\/4\/2026\/10\/iStock-1062676800_jewelryacid.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":13598,"url":"https:\/\/www.thermofisher.com\/blog\/metals\/how-rhodium-plating-impacts-gold-xrf-analysis-and-karat-verification\/","url_meta":{"origin":2998,"position":5},"title":"How Rhodium Plating Impacts Gold XRF Analysis and Karat Verification","author":"Marlene Gasdia-Cochrane","date":"July 28, 2026","format":false,"excerpt":"Summary Accurate gold analysis is essential for jewelry verification, precious metals trading, refining, and quality control. One of the most widely used methods for determining gold content is X-ray fluorescence (XRF) analysis, a non-destructive testing technique that quickly evaluates metal composition. However, rhodium plating\u2014a common surface treatment used on white\u2026","rel":"","context":"In "Metals & Alloys"","block_context":{"text":"Metals & Alloys","link":"https:\/\/admin.acceleratingscience.com\/metals\/metals-and-alloys\/"},"img":{"alt_text":"Banner of a cube symbolizing element number 45 of the periodic table. Rhodium. 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