{ "name": "Jewelers Gallery jewellery reference dataset", "description": "Hallmarks and their millesimal fineness, bullion and junk-silver coin specifications with derived precious-metal content, ring size conversions, metal densities, and the weight units precious metals are traded in.", "url": "https://jewelersgallery.com/reference/", "data": "https://jewelersgallery.com/reference.json", "licence": "CC BY 4.0", "licenceUrl": "https://creativecommons.org/licenses/by/4.0/", "attribution": "Jewellery reference data by Jewelers Gallery (https://jewelersgallery.com)", "method": "https://jewelersgallery.com/how-the-numbers-work/", "readThisFirst": [ "A hallmark is a nominal claim about purity, not a measurement of it. A stamp tells you what the maker asserted; only an assay tells you what the metal is.", "Where a legal standard and plain division disagree, this data follows the stamp. 14K is 583.3 by division and is stamped 583 in the US or 585 in Europe — both appear, and neither is an error.", "Gold-PLATED marks state no quantity at all, so their gold content is null rather than zero or a guess. Only gold-FILLED marks define a fraction of total weight.", "Alloy densities are ranges because composition varies between makers. A single density for an alloy is a fiction; the range is the honest form.", "Coin silver and gold content is DERIVED from published gross weight and fineness, not copied from a table. Circulated coins have lost weight to wear, so real content is at or slightly below these figures.", "Ring sizes are conventions laid over a diameter in millimetres. National scales do not align exactly, so a converted size is the nearest equivalent, not an identity.", "These are reference constants and standards, not live prices. Nothing here is an appraisal or a valuation." ], "units": { "note": "Exact definitions, not measurements. A troy ounce is defined, not weighed.", "gramsPerTroyOunce": 31.1034768, "gramsPerPennyweight": 1.555174, "gramsPerTroyGrain": 0.064799, "gramsPerAvoirdupoisOunce": 28.349523125, "gramsPerTola": 11.663804, "gramsPerThaiBahtBullion": 15.244 }, "hallmarkKinds": [ { "id": "solid", "label": "Solid precious metal", "description": "The piece is an alloy of the metal named, all the way through. These marks state how much of it is the pure metal, in parts per thousand." }, { "id": "layered", "label": "Plated, filled and rolled", "description": "A thin layer of precious metal over a base-metal core. The layer is real gold or silver, and there is not enough of it to be worth recovering — refiners will not normally buy these at all." }, { "id": "not-precious", "label": "No precious metal at all", "description": "Marks that look like precious-metal marks and are not. Several of these contain the word \"silver\" and none of them contain any silver." }, { "id": "system", "label": "Assay and maker marks", "description": "The rest of a hallmark: who made it, who tested it, and when. Only some countries operate a system like this." } ], "hallmarks": [ { "stamp": "375", "aliases": [ "9K", "9CT" ], "kind": "solid", "millesimal": 375, "metal": "gold", "meaning": "9 carat gold — 37.5% gold, the rest other metals.", "detail": "Legal to sell as gold in the UK and Ireland but not in the US, where the floor is 10K. Hard-wearing, and noticeably paler than 18K.", "where": "UK, Ireland" }, { "stamp": "417", "aliases": [ "10K", "10KT" ], "kind": "solid", "millesimal": 417, "metal": "gold", "meaning": "10 carat gold — 41.7% gold.", "detail": "The lowest purity that US law allows to be described as gold.", "where": "US, Canada" }, { "stamp": "585", "aliases": [ "583", "14K", "14KT", "14KP" ], "kind": "solid", "millesimal": 585, "metal": "gold", "meaning": "14 carat gold — around 58.5% gold.", "detail": "The most common fine-jewellery gold in the US. 14K works out at 583.3 exactly, so you will see both 583 and 585 stamped; the P in 14KP means \"plumb\", i.e. exactly 14K rather than a hair under. It is not plated.", "where": "US, and worldwide" }, { "stamp": "750", "aliases": [ "18K", "18KT", "18CT" ], "kind": "solid", "millesimal": 750, "metal": "gold", "meaning": "18 carat gold — 75% gold.", "detail": "The European fine-jewellery standard. Warmer in colour than 14K and softer.", "where": "Europe, and worldwide" }, { "stamp": "916", "aliases": [ "917", "22K", "22KT" ], "kind": "solid", "millesimal": 916, "metal": "gold", "meaning": "22 carat gold — 91.6% gold.", "detail": "The South Asian standard, and the usual purity for gold bought as a store of value rather than as a design.", "where": "India, Pakistan, Bangladesh, the Gulf" }, { "stamp": "875", "aliases": [ "21K" ], "kind": "solid", "millesimal": 875, "metal": "gold", "meaning": "21 carat gold — 87.5% gold.", "detail": null, "where": "The Gulf, Egypt, North Africa" }, { "stamp": "999", "aliases": [ "24K", "9999" ], "kind": "solid", "millesimal": 999, "metal": "gold", "meaning": "Effectively pure gold.", "detail": "Too soft to hold a stone or survive daily wear, so on jewellery it usually means a bangle or a coin mount rather than a ring.", "where": null }, { "stamp": "925", "aliases": [ "STER", "STG", "STERLING" ], "kind": "solid", "millesimal": 925, "metal": "silver", "meaning": "Sterling silver — 92.5% silver, usually with copper.", "detail": "By far the most common silver mark in the world. All four of these stamps mean exactly the same thing.", "where": null }, { "stamp": "800", "aliases": [], "kind": "solid", "millesimal": 800, "metal": "silver", "meaning": "80% silver.", "detail": "Common on continental European cutlery, cigarette cases and older tableware.", "where": "Germany, Italy, Austria" }, { "stamp": "900", "aliases": [ "COIN" ], "kind": "solid", "millesimal": 900, "metal": "silver", "meaning": "Coin silver — 90% silver.", "detail": "The old US coinage standard; on flatware it usually means pre-1870 American.", "where": null }, { "stamp": "958", "aliases": [ "BRITANNIA" ], "kind": "solid", "millesimal": 958, "metal": "silver", "meaning": "Britannia silver — 95.8% silver.", "detail": null, "where": "UK" }, { "stamp": "PLAT", "aliases": [ "PT950", "950 PLAT", "PLATINUM" ], "kind": "solid", "millesimal": 950, "metal": "platinum", "meaning": "Platinum, normally 95% pure.", "detail": "Much denser than gold — a platinum ring feels obviously heavy for its size, and that heft is the quickest informal check there is.", "where": null }, { "stamp": "PD950", "aliases": [ "PALL", "PD500" ], "kind": "solid", "millesimal": 950, "metal": "palladium", "meaning": "Palladium.", "detail": "Looks like platinum and weighs about half as much. Widely used for white wedding bands in the 2000s.", "where": null }, { "stamp": "GP", "aliases": [ "GEP", "GOLD PLATED", "18KGP", "14KGP" ], "kind": "layered", "millesimal": null, "metal": null, "meaning": "Gold plated — a microscopically thin layer of gold over another metal.", "detail": "A number in front of GP describes only the plating, not the item. \"18KGP\" is not 18 carat gold; it is 18 carat gold plating over something else, and the layer is typically under half a micron.", "where": null }, { "stamp": "GF", "aliases": [ "1/20 12K GF", "1/10 14K GF", "GOLD FILLED" ], "kind": "layered", "millesimal": null, "metal": null, "meaning": "Gold filled — a bonded layer of gold that is a stated fraction of the total weight.", "detail": "Far thicker than plating, and the fraction is on the stamp: \"1/20 12K GF\" means one twentieth of the weight is 12K gold. It wears for decades, but the gold content is still too small for a scrap buyer to be interested.", "where": null }, { "stamp": "RGP", "aliases": [ "ROLLED GOLD", "RG" ], "kind": "layered", "millesimal": null, "metal": null, "meaning": "Rolled gold plate — like gold filled, with a thinner layer.", "detail": null, "where": null }, { "stamp": "HGE", "aliases": [ "HEAVY GOLD ELECTROPLATE" ], "kind": "layered", "millesimal": null, "metal": null, "meaning": "Heavy gold electroplate — plating, despite the word heavy.", "detail": "Applied by electricity rather than bonded under heat and pressure. Thinner than gold filled.", "where": null }, { "stamp": "VERMEIL", "aliases": [], "kind": "layered", "millesimal": null, "metal": null, "meaning": "Gold over sterling silver.", "detail": "The exception worth knowing in this group: the core is real silver, so a vermeil piece does have recoverable metal value — as silver.", "where": null }, { "stamp": "NS", "aliases": [ "NICKEL SILVER", "GERMAN SILVER", "ALPACA", "ALPACCA" ], "kind": "not-precious", "millesimal": null, "metal": null, "meaning": "Contains no silver whatsoever.", "detail": "A copper, nickel and zinc alloy that happens to be silver-coloured. The name is a description of the colour, and it has misled people for two hundred years.", "where": null }, { "stamp": "EPNS", "aliases": [ "EP", "A1", "SILVER ON COPPER" ], "kind": "not-precious", "millesimal": null, "metal": null, "meaning": "Electroplated nickel silver — a silver skin over the alloy above.", "detail": "Very common on Victorian and Edwardian tableware. The plate is too thin to recover.", "where": null }, { "stamp": "SS", "aliases": [], "kind": "not-precious", "millesimal": null, "metal": null, "meaning": "Ambiguous, and worth resolving before you assume.", "detail": "On jewellery SS most often means stainless steel. Some makers have used it for sterling silver. A magnet settles it in a second: stainless is usually magnetic and silver never is.", "where": null }, { "stamp": "BASE", "aliases": [ "BM", "STEEL", "BRASS" ], "kind": "not-precious", "millesimal": null, "metal": null, "meaning": "Base metal, stated plainly.", "detail": null, "where": null }, { "stamp": "UK hallmark", "aliases": [], "kind": "system", "millesimal": null, "metal": null, "meaning": "Three compulsory marks struck by an assay office that physically tested the metal.", "detail": "A sponsor mark saying who submitted it, a millesimal fineness number in a shaped shield, and the assay office town mark — a leopard’s head for London, an anchor for Birmingham, a rose for Sheffield, a castle for Edinburgh. This is the strongest assurance in the world that a stamp is true, because the state tested it rather than the seller.", "where": "UK, Ireland" }, { "stamp": "Date letter", "aliases": [], "kind": "system", "millesimal": null, "metal": null, "meaning": "A letter in a shaped shield giving the year the piece was assayed.", "detail": "Optional in the UK since 1999 but struck for centuries before that. The letter, its typeface and the shape around it together identify a single year, which is how British silver can be dated exactly.", "where": "UK" }, { "stamp": "Eagle's head", "aliases": [ "Minerva head", "Crab", "Boar’s head", "Dog’s head" ], "kind": "system", "millesimal": null, "metal": null, "meaning": "French assay marks, which are animals and heads rather than numbers.", "detail": "An eagle’s head is 18 carat gold. A helmeted Minerva head is silver — first standard 950, second standard 800. A boar’s head was Paris silver and a crab provincial silver until 1962, when the crab took over for all of it. Platinum is a dog’s head, used since 1912.", "where": "France" }, { "stamp": "Maker’s mark", "aliases": [], "kind": "system", "millesimal": null, "metal": null, "meaning": "Initials or a symbol in a shaped surround, identifying who made or sponsored it.", "detail": "On its own it says nothing about purity. Next to a recognised maker it can be worth many times the metal — which is the strongest reason to identify a mark before selling anything for scrap.", "where": null } ], "layeredGold": [ { "mark": "1/20 12K GF", "id": "gf-1-20-12k", "weightFraction": 0.05, "layerKarat": 12, "note": "The commonest gold-filled mark. One twentieth of the total weight is 12 carat gold." }, { "mark": "1/20 14K GF", "id": "gf-1-20-14k", "weightFraction": 0.05, "layerKarat": 14, "note": "Same fraction, higher-carat layer." }, { "mark": "1/10 12K GF", "id": "gf-1-10-12k", "weightFraction": 0.1, "layerKarat": 12, "note": "A tenth of the weight — twice the gold of a 1/20 mark." }, { "mark": "1/10 14K GF", "id": "gf-1-10-14k", "weightFraction": 0.1, "layerKarat": 14, "note": "The heaviest common gold-filled standard." }, { "mark": "RGP · rolled gold plate", "id": "rgp", "weightFraction": null, "layerKarat": null, "note": "Bonded like gold filled but thinner, and the mark states no fraction. Nothing can be calculated from it." }, { "mark": "GP · gold plated", "id": "gp", "weightFraction": null, "layerKarat": null, "note": "An electroplated layer, typically well under half a micron. The karat on the mark describes the plating, not the item, and no quantity is stated." }, { "mark": "HGE · heavy gold electroplate", "id": "hge", "weightFraction": null, "layerKarat": null, "note": "Still plating, despite the word heavy. Thicker than GP, thinner than gold filled, and unquantified." } ], "coinCountries": [ { "id": "US", "label": "United States", "currency": "$" }, { "id": "UK", "label": "United Kingdom", "currency": "£" }, { "id": "CA", "label": "Canada", "currency": "$" } ], "coins": [ { "id": "us-dime-90", "country": "US", "name": "Dime", "years": "1892–1964", "grossWeightGrams": 2.5, "fineness": 900, "faceValue": 0.1, "silverGrams": 2.25, "actualSilverWeightTroyOz": 0.0723, "note": "Barber, Mercury and Roosevelt. All three share the specification." }, { "id": "us-quarter-90", "country": "US", "name": "Quarter", "years": "1892–1964", "grossWeightGrams": 6.25, "fineness": 900, "faceValue": 0.25, "silverGrams": 5.625, "actualSilverWeightTroyOz": 0.1808, "note": "Barber, Standing Liberty and Washington." }, { "id": "us-half-90", "country": "US", "name": "Half dollar", "years": "1892–1964", "grossWeightGrams": 12.5, "fineness": 900, "faceValue": 0.5, "silverGrams": 11.25, "actualSilverWeightTroyOz": 0.3617, "note": "Barber, Walking Liberty, Franklin, and the 1964 Kennedy." }, { "id": "us-dollar-90", "country": "US", "name": "Silver dollar", "years": "1878–1935", "grossWeightGrams": 26.73, "fineness": 900, "faceValue": 1, "silverGrams": 24.057, "actualSilverWeightTroyOz": 0.7735, "note": "Morgan and Peace. Very often worth more to a collector than to a refiner." }, { "id": "us-half-40", "country": "US", "name": "Half dollar, 40%", "years": "1965–1970", "grossWeightGrams": 11.5, "fineness": 400, "faceValue": 0.5, "silverGrams": 4.6, "actualSilverWeightTroyOz": 0.1479, "note": "Kennedy only. A silver-clad sandwich rather than an alloy throughout." }, { "id": "us-ike-40", "country": "US", "name": "Eisenhower dollar, 40%", "years": "1971–1976", "grossWeightGrams": 24.59, "fineness": 400, "faceValue": 1, "silverGrams": 9.836, "actualSilverWeightTroyOz": 0.3162, "note": "Only the collector issues. The circulating Eisenhower dollar has no silver at all." }, { "id": "us-war-nickel", "country": "US", "name": "War nickel", "years": "1942–1945", "grossWeightGrams": 5, "fineness": 350, "faceValue": 0.05, "silverGrams": 1.75, "actualSilverWeightTroyOz": 0.0563, "note": "Identified by the large mint mark above Monticello. Ordinary nickels contain none." }, { "id": "uk-crown-925", "country": "UK", "name": "Crown", "years": "to 1919", "grossWeightGrams": 28.2759, "fineness": 925, "faceValue": 0.25, "silverGrams": 26.1552, "actualSilverWeightTroyOz": 0.8409, "note": null }, { "id": "uk-halfcrown-925", "country": "UK", "name": "Half crown", "years": "to 1919", "grossWeightGrams": 14.138, "fineness": 925, "faceValue": 0.125, "silverGrams": 13.0777, "actualSilverWeightTroyOz": 0.4205, "note": null }, { "id": "uk-florin-925", "country": "UK", "name": "Florin", "years": "to 1919", "grossWeightGrams": 11.3104, "fineness": 925, "faceValue": 0.1, "silverGrams": 10.4621, "actualSilverWeightTroyOz": 0.3364, "note": null }, { "id": "uk-shilling-925", "country": "UK", "name": "Shilling", "years": "to 1919", "grossWeightGrams": 5.6552, "fineness": 925, "faceValue": 0.05, "silverGrams": 5.2311, "actualSilverWeightTroyOz": 0.1682, "note": null }, { "id": "uk-sixpence-925", "country": "UK", "name": "Sixpence", "years": "to 1919", "grossWeightGrams": 2.8276, "fineness": 925, "faceValue": 0.025, "silverGrams": 2.6155, "actualSilverWeightTroyOz": 0.0841, "note": null }, { "id": "uk-halfcrown-500", "country": "UK", "name": "Half crown", "years": "1920–1946", "grossWeightGrams": 14.138, "fineness": 500, "faceValue": 0.125, "silverGrams": 7.069, "actualSilverWeightTroyOz": 0.2273, "note": "Silver was halved in 1920 and removed entirely after 1946." }, { "id": "uk-florin-500", "country": "UK", "name": "Florin", "years": "1920–1946", "grossWeightGrams": 11.3104, "fineness": 500, "faceValue": 0.1, "silverGrams": 5.6552, "actualSilverWeightTroyOz": 0.1818, "note": null }, { "id": "uk-shilling-500", "country": "UK", "name": "Shilling", "years": "1920–1946", "grossWeightGrams": 5.6552, "fineness": 500, "faceValue": 0.05, "silverGrams": 2.8276, "actualSilverWeightTroyOz": 0.0909, "note": null }, { "id": "uk-sixpence-500", "country": "UK", "name": "Sixpence", "years": "1920–1946", "grossWeightGrams": 2.8276, "fineness": 500, "faceValue": 0.025, "silverGrams": 1.4138, "actualSilverWeightTroyOz": 0.0455, "note": null }, { "id": "ca-dime-800", "country": "CA", "name": "Dime", "years": "1920–1966", "grossWeightGrams": 2.3328, "fineness": 800, "faceValue": 0.1, "silverGrams": 1.8662, "actualSilverWeightTroyOz": 0.06, "note": null }, { "id": "ca-quarter-800", "country": "CA", "name": "Quarter", "years": "1920–1966", "grossWeightGrams": 5.8319, "fineness": 800, "faceValue": 0.25, "silverGrams": 4.6655, "actualSilverWeightTroyOz": 0.15, "note": null }, { "id": "ca-half-800", "country": "CA", "name": "Half dollar", "years": "1920–1966", "grossWeightGrams": 11.6638, "fineness": 800, "faceValue": 0.5, "silverGrams": 9.331, "actualSilverWeightTroyOz": 0.3, "note": null }, { "id": "ca-dollar-800", "country": "CA", "name": "Silver dollar", "years": "1935–1966", "grossWeightGrams": 23.3276, "fineness": 800, "faceValue": 1, "silverGrams": 18.6621, "actualSilverWeightTroyOz": 0.6, "note": null } ], "densities": [ { "id": "platinum", "name": "Platinum", "category": "precious", "gramsPerCm3": 21.45, "gramsPerCm3Range": null, "note": "The densest metal jewellery is normally made from." }, { "id": "gold", "name": "Gold (pure, 24K)", "category": "precious", "gramsPerCm3": 19.32, "gramsPerCm3Range": null, "note": null }, { "id": "tungsten", "name": "Tungsten", "category": "base", "gramsPerCm3": 19.25, "gramsPerCm3Range": null, "note": "Within 0.4% of pure gold — the reason tungsten-filled fake bars and coins pass a casual weight check." }, { "id": "lead", "name": "Lead", "category": "base", "gramsPerCm3": 11.34, "gramsPerCm3Range": null, "note": null }, { "id": "palladium", "name": "Palladium", "category": "precious", "gramsPerCm3": 12.02, "gramsPerCm3Range": null, "note": null }, { "id": "silver", "name": "Silver (fine, 999)", "category": "precious", "gramsPerCm3": 10.49, "gramsPerCm3Range": null, "note": null }, { "id": "nickel", "name": "Nickel", "category": "base", "gramsPerCm3": 8.9, "gramsPerCm3Range": null, "note": null }, { "id": "copper", "name": "Copper", "category": "base", "gramsPerCm3": 8.96, "gramsPerCm3Range": null, "note": null }, { "id": "brass", "name": "Brass", "category": "alloy", "gramsPerCm3": null, "gramsPerCm3Range": { "low": 8.4, "high": 8.73 }, "note": "Copper-zinc alloy; density depends on the mix." }, { "id": "stainless", "name": "Stainless steel", "category": "alloy", "gramsPerCm3": null, "gramsPerCm3Range": { "low": 7.7, "high": 8.1 }, "note": "Common in fashion jewellery and watch cases; varies by grade." }, { "id": "iron", "name": "Iron", "category": "base", "gramsPerCm3": 7.87, "gramsPerCm3Range": null, "note": null }, { "id": "tin", "name": "Tin", "category": "base", "gramsPerCm3": 7.31, "gramsPerCm3Range": null, "note": null }, { "id": "zinc", "name": "Zinc", "category": "base", "gramsPerCm3": 7.14, "gramsPerCm3Range": null, "note": null }, { "id": "titanium", "name": "Titanium", "category": "base", "gramsPerCm3": 4.51, "gramsPerCm3Range": null, "note": "Popular for men’s bands because it is so much lighter than everything above it." } ], "ringSizes": [ { "us": 3, "uk": "F½", "eu": 44.2, "jp": 4, "insideDiameterMm": 14.07, "insideCircumferenceMm": 44.21 }, { "us": 3.5, "uk": "G½", "eu": 45.5, "jp": 5, "insideDiameterMm": 14.48, "insideCircumferenceMm": 45.48 }, { "us": 4, "uk": "H½", "eu": 46.8, "jp": 7, "insideDiameterMm": 14.88, "insideCircumferenceMm": 46.76 }, { "us": 4.5, "uk": "I½", "eu": 48, "jp": 8, "insideDiameterMm": 15.29, "insideCircumferenceMm": 48.04 }, { "us": 5, "uk": "J½", "eu": 49.3, "jp": 9, "insideDiameterMm": 15.7, "insideCircumferenceMm": 49.31 }, { "us": 5.5, "uk": "K½", "eu": 50.6, "jp": 10, "insideDiameterMm": 16.1, "insideCircumferenceMm": 50.59 }, { "us": 6, "uk": "L½", "eu": 51.9, "jp": 12, "insideDiameterMm": 16.51, "insideCircumferenceMm": 51.87 }, { "us": 6.5, "uk": "M½", "eu": 53.1, "jp": 13, "insideDiameterMm": 16.92, "insideCircumferenceMm": 53.14 }, { "us": 7, "uk": "N½", "eu": 54.4, "jp": 14, "insideDiameterMm": 17.32, "insideCircumferenceMm": 54.42 }, { "us": 7.5, "uk": "O½", "eu": 55.7, "jp": 15, "insideDiameterMm": 17.73, "insideCircumferenceMm": 55.7 }, { "us": 8, "uk": "P½", "eu": 57, "jp": 16, "insideDiameterMm": 18.14, "insideCircumferenceMm": 56.97 }, { "us": 8.5, "uk": "Q½", "eu": 58.3, "jp": 18, "insideDiameterMm": 18.54, "insideCircumferenceMm": 58.25 }, { "us": 9, "uk": "R½", "eu": 59.5, "jp": 19, "insideDiameterMm": 18.95, "insideCircumferenceMm": 59.53 }, { "us": 9.5, "uk": "S½", "eu": 60.8, "jp": 20, "insideDiameterMm": 19.35, "insideCircumferenceMm": 60.8 }, { "us": 10, "uk": "T½", "eu": 62.1, "jp": 21, "insideDiameterMm": 19.76, "insideCircumferenceMm": 62.08 }, { "us": 10.5, "uk": "U½", "eu": 63.4, "jp": 23, "insideDiameterMm": 20.17, "insideCircumferenceMm": 63.36 }, { "us": 11, "uk": "V½", "eu": 64.6, "jp": 24, "insideDiameterMm": 20.57, "insideCircumferenceMm": 64.64 }, { "us": 11.5, "uk": "W½", "eu": 65.9, "jp": 25, "insideDiameterMm": 20.98, "insideCircumferenceMm": 65.91 }, { "us": 12, "uk": "X½", "eu": 67.2, "jp": 26, "insideDiameterMm": 21.39, "insideCircumferenceMm": 67.19 }, { "us": 12.5, "uk": "Y½", "eu": 68.5, "jp": 27, "insideDiameterMm": 21.79, "insideCircumferenceMm": 68.47 }, { "us": 13, "uk": "Z½", "eu": 69.7, "jp": 29, "insideDiameterMm": 22.2, "insideCircumferenceMm": 69.74 }, { "us": 13.5, "uk": "Z+1½", "eu": 71, "jp": 30, "insideDiameterMm": 22.61, "insideCircumferenceMm": 71.02 }, { "us": 14, "uk": "Z+2½", "eu": 72.3, "jp": 31, "insideDiameterMm": 23.01, "insideCircumferenceMm": 72.3 } ] }