Knowledge (XXG)

Carat (mass)

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countries, and was finally proposed by the International Committee of Weights and Measures, and unanimously accepted at the fourth sexennial General Conference of the Metric Convention held in Paris in October 1907. It was soon made compulsory by law in France, but uptake of the new carat was slower in England, where its use was allowed by the
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An 'international carat' of 205 milligrams was proposed in 1871 by the Syndical Chamber of Jewellers, etc., in Paris, and accepted in 1877 by the Syndical Chamber of Diamond Merchants in Paris. A metric carat of 200 milligrams – exactly one-fifth of a gram – had often been suggested in various
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Carob seeds have been used throughout history to measure jewelry, because it was believed that there was little variance in their mass distribution. However, this was a factual inaccuracy, as their mass varies about as much as seeds of other species.
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comes from carats and grains of gold in a solidus of coin. The conversion rates 1 solidus = 24 carats, 1 carat = 4 grains still stand. Woolhouse's
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grains (~3.168 grains = ~205 mg). Despite it being a non-metric unit, a number of metric countries have used this unit for its limited range of application.
435: 1317: 975:. The weight of a Roman pound is generally believed to have been 327.45 g or possibly up to 5 g less. Therefore, the metric equivalent of 1 457: 386: 1853: 1607: 1203: 189: 1261: 1299: 1176: 540: 184: 442:
of 2 mg. Other subdivisions, and slightly different mass values, have been used in the past in different locations.
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Unlike the modern carat, the Board of Trade carat was not used for measuring pearls; those were measured with
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This article is about the unit of mass used for gemstones and pearls. For the purity scale used for gold, see
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Zhengzhang, Tao (July 1991). "On the origin of the carat as the unit of weight for gemstones".
1163: 2119: 1702: 1460: 1396: 1131: 839:(~3.170 grains = ~205 mg); in 1888, the Board of Trade carat was changed to exactly 450: 256: 1214: 2029: 1858: 1812: 1732: 1544: 1513: 1486: 1452: 1386: 1378: 955:
weight unit. There is literary evidence that the weight of 72 coins of the type called
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One or more of the preceding sentences incorporates text from this source, which is in the
1340: 2124: 2059: 1870: 1843: 1182: 484: 438:, and soon afterwards in many countries around the world. The carat is divisible into 100 251: 215: 169: 1573: 1280: 2477: 2421: 2409: 2338: 1982: 1920: 1697: 1391: 1366: 1107: 1040: 1027: 957: 817: 812: 492: 2592: 2552: 2482: 2441: 2109: 1863: 1848: 1797: 1472: 1419: 1023: 266: 220: 2577: 2572: 2567: 2472: 2302: 2248: 2034: 1915: 1875: 1767: 1164:
Comptes rendus des séances de la quatrième conférence générale des poids et mesures
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was approximately 189 mg. The Greeks had a similar unit of the same value.
962: 507: 225: 17: 2348: 2293: 2168: 2081: 2049: 2039: 1941: 1890: 1827: 1802: 1677: 1548: 1365:
Turnbull, L. A.; Santamaria, L.; Martorell, T.; Rallo, J.; Hector, A. (2006).
999: 419: 101: 1464: 2494: 2487: 2358: 2353: 2333: 2258: 2183: 2177: 2158: 2054: 1995: 1910: 1807: 1742: 1717: 1707: 1637: 1616: 1517: 785: 734: 714: 522:
In the past, each country had its own carat. It was often used for weighing
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of 60 grains troy each; and the pound grain was divisible into four
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of 5 grains troy each; and the ounce grain was divisible into four
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Grierson, Philip (1960). "The Monetary Reforms of 'Abd Al-Malik".
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of 240 grains troy each; the pound carat was divisible into four
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The post-1887 Board of Trade carat, of which there were exactly
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of 20 grains troy each; the ounce carat was divisible into four
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Diamond-weighing kit, with weights labelled in grams and carats
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First attested in English in the mid-15th century, the word
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adopted the metric carat definition on July 1, 1913, the
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Journal of the Economic and Social History of the Orient
1061:, was approximately 205.4094 mg (3.169951 gr). 453:
is a flawless stone of at least 100 carats (20 g).
860:, but measurements were typically made in multiples of 1328:
on August 24, 2010 – via oxforddictionaries.com.
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American Heritage Dictionary of the English Language
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American Association for the Advancement of Science
135: 113: 97: 75: 67: 62: 39: 1285:An Etymological Dictionary of the English Language 1181:. Houghton Mifflin Harcourt. 2013. Archived from 856:The Board of Trade carat was divisible into four 430:. The current definition, sometimes known as the 541:Weights and Measures (Metric System) Act of 1897 1426:"Notes on the weight of the 'Cullinan' diamond" 1106:The refiners' carats were the offspring of the 994:gives gold fineness in carats of 4 grains, and 1432:. Vol. XV, no. 71. pp. 318–326. 1601: 1367:"Seed size variability: From carob to carats" 8: 1575:Measures, Weights and Moneys of All Nations 992:Measures, Weights and Moneys of All Nations 1978: 1787: 1608: 1594: 1586: 1493:(6th ed.). London: Bickers & Son. 550: 436:General Conference on Weights and Measures 152: 45: 36: 1390: 1255: 1253: 1231: 1229: 1227: 1287:. London: Henry Frowde. pp. 93–94. 1159: 1157: 1155: 1123: 1108:carat as a measure of fineness for gold 1015: 463:standard abbreviation for the carat is 326: 305: 279: 233: 202: 176: 160: 1298:Liddell, Henry George; Scott, Robert. 1260:Liddell, Henry George; Scott, Robert. 909:of 15 grains troy each. Likewise, the 1567: 1565: 7: 1543:(3). Cambridge University: 803–839. 885:once used in the United Kingdom—the 434:, was adopted in 1907 at the Fourth 1491:Hall Marks on Gold and Silver Plate 1043:carat, of which there were exactly 25: 881:There were also two varieties of 117: 79: 1413: 965:, and that the weight of 1  491:; قيراط), in turn borrowed from 371: 361: 360: 168: 1537:The Journal of Economic History 1445:Chinese Journal of Geochemistry 422:), which is used for measuring 1306:– via Perseus.Tufts.edu. 1268:– via Perseus.Tufts.edu. 1: 1572:Woolhouse, W. S. B. (1891). 114:Conversions (imperial) 1424:Leonard J. Spencer (1910). 1243:Online Etymology Dictionary 306:Imitations and enhancements 2625: 998:in troy pounds of 12  29: 2545: 1549:10.1017/S0022050716000826 1279:Skeat, Walter W. (1888). 131: 93: 44: 340:Schiphol Airport robbery 190:Crystallographic defects 51:A 1-carat (200 mg) 2110:Nickel silver (alpacca) 1518:10.1163/156852060X00098 1304:A Greek-English Lexicon 1266:A Greek-English Lexicon 1204:"ANSI Units of Measure" 502:seed', a diminutive of 345:Graff Diamonds robbery 195:Formation and surfacing 1430:Mineralogical Magazine 1383:10.1098/rsbl.2006.0476 913:was divisible into 24 897:was divisible into 24 547:Historical definitions 391: 2451:Other natural objects 1339:Naturski, Sebastian. 876: 389: 350:Belgium diamond heist 32:Fineness § Karat 1926:Wire wrapped jewelry 1906:Repoussé and chasing 1345:Your Diamond Teacher 335:Millennium Dome raid 262:The diamond industry 2468:Ebonite (vulcanite) 1322:Oxford Dictionaries 1140:. 1908. p. 144 675:London-New York (2) 657:London-New York (1) 625:International carat 553: 483:, which comes from 479:comes from Italian 185:Material properties 156:Part of a series on 126:... is equal to ... 119:1 imp ct 88:... is equal to ... 63:General information 1813:Jewellery designer 1531:Harper, K (2016). 1457:10.1007/BF02843332 1220:on April 17, 2012. 939:grains troy each. 552:Carat before 1907 551: 410:equal to 200  392: 257:Synthetic diamonds 242:Diamond (gemstone) 145:    137:    107:    99:    2586: 2585: 2503: 2502: 2373:Organic gemstones 1970: 1969: 1487:Chaffers, William 1236:Harper, Douglas. 807:UK Board of Trade 804: 803: 694:Paris, East India 384: 383: 151: 150: 76:Conversions 16:(Redirected from 2616: 2609:Metricated units 2604:Jewellery making 2030:Britannia silver 1979: 1788: 1610: 1603: 1596: 1587: 1580: 1579: 1569: 1560: 1559: 1557: 1555: 1528: 1522: 1521: 1501: 1495: 1494: 1483: 1477: 1476: 1440: 1434: 1433: 1417: 1416: 1411: 1405: 1404: 1394: 1362: 1356: 1355: 1353: 1351: 1336: 1330: 1329: 1324:. Archived from 1314: 1308: 1307: 1295: 1289: 1288: 1276: 1270: 1269: 1257: 1248: 1247: 1233: 1222: 1221: 1219: 1208: 1200: 1194: 1193: 1191: 1190: 1173: 1167: 1161: 1150: 1149: 1147: 1145: 1128: 1111: 1104: 1098: 1091: 1085: 1083: 1082: 1078: 1075: 1068: 1062: 1056: 1055: 1051: 1048: 1037: 1031: 1030:on 1 April 1914. 1020: 938: 937: 933: 930: 883:refiners' carats 877:Refiners' carats 872: 871: 867: 864: 852: 851: 847: 844: 835: 834: 830: 827: 554: 375: 364: 363: 172: 153: 146: 138: 108: 100: 49: 37: 21: 18:Point (gemstone) 2624: 2623: 2619: 2618: 2617: 2615: 2614: 2613: 2589: 2588: 2587: 2582: 2541: 2499: 2488:Spondylus shell 2446: 2368: 2139: 2125:Stainless steel 2076: 2060:Sterling silver 2020:Precious metal 2015: 1983:Precious metals 1966: 1930: 1832: 1779: 1619: 1614: 1584: 1583: 1571: 1570: 1563: 1553: 1551: 1530: 1529: 1525: 1503: 1502: 1498: 1485: 1484: 1480: 1442: 1441: 1437: 1423: 1414: 1412: 1408: 1371:Biology Letters 1364: 1363: 1359: 1349: 1347: 1338: 1337: 1333: 1316: 1315: 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89: 86: 84: 80: 74: 70: 66: 61: 57: 54: 48: 43: 38: 33: 19: 2578:Wearable art 2573:Phaleristics 2568:Metalworking 2519: 2473:Gutta-percha 2249:Lapis lazuli 2035:Colored gold 1916:Stonesetting 1574: 1552:. Retrieved 1540: 1536: 1526: 1509: 1505: 1499: 1490: 1481: 1448: 1444: 1438: 1429: 1409: 1374: 1370: 1360: 1348:. Retrieved 1344: 1334: 1326:the original 1321: 1312: 1303: 1293: 1284: 1274: 1265: 1241: 1215:the original 1210: 1198: 1187:. Retrieved 1183:the original 1177: 1171: 1142:. 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Index

Point (gemstone)
Fineness § Karat

brilliant
diamond
milligrams
ounces
Diamonds

Material properties
Crystallographic defects
Formation and surfacing
Carat
Clarity
Color
Cut
Diamond (gemstone)
List of mines
Diamond cutting
Synthetic diamonds
The diamond industry
Blood diamond
De Beers
History
Symbolism
Famous diamonds
Simulants
Enhancements
Millennium Dome raid
Schiphol Airport robbery

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