{"id":177,"date":"2026-08-04T17:16:31","date_gmt":"2026-08-04T17:16:31","guid":{"rendered":"https:\/\/maisonfacelis.com\/journal\/?p=177"},"modified":"2026-08-04T17:16:32","modified_gmt":"2026-08-04T17:16:32","slug":"how-professionals-grade-diamonds","status":"publish","type":"post","link":"https:\/\/maisonfacelis.com\/journal\/2026\/08\/04\/how-professionals-grade-diamonds\/","title":{"rendered":"How Professionals Grade Diamonds"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Diamond grading is a careful process designed to describe a diamond\u2019s characteristics consistently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Professional gemologists examine cut, colour, clarity, carat weight, proportions, polish, symmetry, and other identifying features under controlled conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding how grading works can help buyers interpret a laboratory report more confidently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Diamond Is Examined Loose<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Diamonds are normally graded before they are mounted in jewellery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A setting can hide inclusions, affect colour perception, and prevent accurate weight and proportion measurements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Grading a loose diamond allows the gemologist to inspect the entire stone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Carat Weight Is Measured<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The diamond is weighed using a highly precise scale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Carat weight is recorded to the hundredth of a carat, although equipment may measure more precisely during the grading process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One carat equals 0.2 grams.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weight alone does not determine visual size. The grader also records the diamond\u2019s measurements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Colour Is Graded Under Controlled Conditions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Colour grading is usually performed using standard lighting and a neutral viewing environment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The diamond may be compared with reference diamonds representing established colour grades.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">White diamonds are commonly graded from D to Z. D represents the least visible colour, while increasing letters indicate more noticeable yellow or brown tones.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because colour differences can be subtle, more than one grader may assess the stone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Clarity Is Examined Under Magnification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Gemologists inspect diamonds under standard magnification and appropriate lighting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They identify internal inclusions and surface blemishes, considering:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Size<\/li>\n\n\n\n<li>Number<\/li>\n\n\n\n<li>Position<\/li>\n\n\n\n<li>Nature<\/li>\n\n\n\n<li>Relief or contrast<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The grader then assigns a clarity grade based on the overall visibility and significance of these characteristics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A diagram may be included on the report to show the approximate position of identifying features.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cut Is Evaluated<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For standard round brilliant diamonds, cut grading may consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Proportions<\/li>\n\n\n\n<li>Brightness<\/li>\n\n\n\n<li>Fire<\/li>\n\n\n\n<li>Scintillation<\/li>\n\n\n\n<li>Weight ratio<\/li>\n\n\n\n<li>Durability<\/li>\n\n\n\n<li>Polish<\/li>\n\n\n\n<li>Symmetry<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Measurements such as table percentage, depth percentage, crown angle, pavilion angle, girdle thickness, and culet size may be analysed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fancy-shaped diamonds may not receive an overall cut grade from certain laboratories. Their appearance is often evaluated through measurements, symmetry, polish, outline, and visual performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Polish and Symmetry<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Polish describes the quality of the diamond\u2019s surface finish.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Symmetry evaluates the alignment and consistency of its facets and overall shape.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common grades include Excellent, Very Good, Good, Fair, and Poor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Minor polish or symmetry features may not be visible without magnification, but they form part of the technical evaluation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fluorescence Is Recorded<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Some diamonds emit visible light when exposed to ultraviolet energy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fluorescence is commonly described using levels such as None, Faint, Medium, Strong, or Very Strong.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is normally recorded as an identifying characteristic rather than included within the 4Cs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In many diamonds, fluorescence has little noticeable effect under normal lighting.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Independent Verification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Reputable laboratories use trained graders, standardised conditions, and quality-control procedures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A grading report provides an independent description of the diamond but is not an appraisal or guarantee of retail value.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Buyers should still examine videos, images, proportions, and the actual appearance of the stone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Final Thoughts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Professional diamond grading combines precise measurement with expert visual assessment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The process allows diamonds to be compared using a common language. However, grading reports describe quality characteristics rather than emotional beauty.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Use the report to narrow your choices, then evaluate how the diamond actually looks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Diamond grading is a careful process designed to describe a diamond\u2019s characteristics consistently. Professional gemologists examine cut, colour, clarity, carat [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[31,26],"tags":[],"class_list":["post-177","post","type-post","status-publish","format-standard","hentry","category-buying-guides","category-diamond-education"],"_links":{"self":[{"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/posts\/177","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/comments?post=177"}],"version-history":[{"count":1,"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/posts\/177\/revisions"}],"predecessor-version":[{"id":178,"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/posts\/177\/revisions\/178"}],"wp:attachment":[{"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/media?parent=177"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/categories?post=177"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/maisonfacelis.com\/journal\/wp-json\/wp\/v2\/tags?post=177"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}