{"id":244793,"date":"2017-09-12T13:07:44","date_gmt":"2017-09-12T17:07:44","guid":{"rendered":"https:\/\/www.1stdibs.com\/blogs\/the-study\/?p=244793"},"modified":"2021-12-15T07:52:08","modified_gmt":"2021-12-15T12:52:08","slug":"4-cs-grading-diamonds","status":"publish","type":"post","link":"https:\/\/www.1stdibs.com\/blogs\/the-study\/4-cs-grading-diamonds\/","title":{"rendered":"What Are the &#8216;4 Cs&#8217; of Grading Diamonds?"},"content":{"rendered":"<div id=\"attachment_246393\" style=\"width: 778px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.1stdibs.com\/jewelry\/rings\/engagement-rings\/ferrucci-gia-certified-502-carat-e-color-if-clarity-high-end-engagement-ring\/id-j_3150473\/\"><img decoding=\"async\" aria-describedby=\"caption-attachment-246393\" class=\"wp-image-246393 size-full\" src=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master.jpg\" alt=\"Ferrucci, GIA Certfied 5.02 Carats, Round Cut, E Color IF Clarity\" width=\"768\" height=\"768\" srcset=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master.jpg 768w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master-350x350.jpg 350w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master-120x120.jpg 120w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master-300x300.jpg 300w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master-216x216.jpg 216w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><p id=\"caption-attachment-246393\" class=\"wp-caption-text\"><a href=\"https:\/\/www.1stdibs.com\/jewelry\/rings\/engagement-rings\/ferrucci-gia-certified-502-carat-e-color-if-clarity-high-end-engagement-ring\/id-j_3150473\/\">Ferrucci 5.02-carat, GIA-certified, round-cut, E-color, IF-clarity diamond ring, 2017<\/a><\/p><\/div>\n<p><!--more-->What makes a diamond valuable? Anyone who has ever had a <a href=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/april-birthstone-diamond\/\">diamond<\/a> appraised has heard of the 4Cs, the grading the system that was established by the Gemological Institute of America (GIA) in the 1950s. The 4Cs are the guidelines that determine how these precious stones \u2014 some of which are <a href=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/most-famous-diamonds\/\">quite famous<\/a> \u2014 are graded.<\/p>\n<h2>Color<\/h2>\n<p>It&#8217;s easy to tell the difference between a white diamond and a brown diamond, but the how about between a faint diamond and a very light one? Diamond graders have master sets of diamonds that they use to compare against other specimens. It should be noted that diamonds must be removed from their setting so that the color of the gold doesn\u2019t interfere with the color of the jewel.<\/p>\n<p>The most valuable stones are are colorless, or pure as water. The GIA scale, which is used by most professional jewelers, ranges from D to Z. There are five main categories of color (judged on the tone and saturation): colorless, near colorless, faint, very light and light. It is all about tone and saturation, and the differences from one category to the next are so subtle that, to the untrained eye, a small diamond with faint color may appear colorless.<\/p>\n<div id=\"attachment_245733\" style=\"width: 691px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.1stdibs.com\/jewelry\/rings\/solitaire-rings\/912-carat-golconda-oval-cut-d-color-internally-flawless-diamond\/id-j_2408043\/\"><img decoding=\"async\" aria-describedby=\"caption-attachment-245733\" class=\"wp-image-245733\" src=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/L4066_3_l-1.jpg\" alt=\"\" width=\"681\" height=\"445\" srcset=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/L4066_3_l-1.jpg 768w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/L4066_3_l-1-535x350.jpg 535w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/L4066_3_l-1-120x78.jpg 120w\" sizes=\"(max-width: 681px) 100vw, 681px\" \/><\/a><p id=\"caption-attachment-245733\" class=\"wp-caption-text\"><a href=\"https:\/\/www.1stdibs.com\/jewelry\/rings\/solitaire-rings\/912-carat-golconda-oval-cut-d-color-internally-flawless-diamond\/id-j_2408043\/\">A 9.12-carat, type-IIa diamond with D color and internally flawless clarity. Offered by J. Birnbach Jewelry<\/a><\/p><\/div>\n<h2>Clarity<\/h2>\n<p>According to the GIA, \u201cclarity is the relative absence of inclusions and blemishes\u201d in a diamond. Inclusions are internal features and blemishes refers to surface irregularities. A diamond should be devoid of flaws, both internally and on the surface.<\/p>\n<p>Once inspected under 10-times magnification, a diamond will fit into one of the 11 universally recognized clarity grades: flawless; internally flawless; two categories of very, very slightly (VVS1, VVS2) included; two categories of slightly included (S1, S2); and three categories of included (I1,I2,I3). The grade is determined by analyzing the \u201csize, number, position, nature, and color or relief.\u201d<\/p>\n<div id=\"attachment_245743\" style=\"width: 545px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.1stdibs.com\/jewelry\/rings\/engagement-rings\/gia-certified-1007-pear-shaped-diamond-engagement-ring\/id-j_3124093\/\"><img decoding=\"async\" aria-describedby=\"caption-attachment-245743\" class=\"wp-image-245743 size-full\" src=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/IMG_5136_master.jpg\" alt=\"\" width=\"535\" height=\"489\" srcset=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/IMG_5136_master.jpg 535w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/IMG_5136_master-383x350.jpg 383w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/IMG_5136_master-120x110.jpg 120w\" sizes=\"(max-width: 535px) 100vw, 535px\" \/><\/a><p id=\"caption-attachment-245743\" class=\"wp-caption-text\"><a href=\"https:\/\/www.1stdibs.com\/jewelry\/rings\/engagement-rings\/gia-certified-1007-pear-shaped-diamond-engagement-ring\/id-j_3124093\/\">A GIA-certified, 10.07-carat pear-shaped diamond engagement ring. Offered by Manfredi Jewels<\/a><\/p><\/div>\n<h2>Cut<\/h2>\n<p>A diamond\u2019s cut goes beyond its shape (emerald, princess, heart, oval, round, pear or marquis). Here, we are concerned with how the diamond\u2019s facets interact with the light. The rule is \u201cthe higher the cut grade, the brighter the diamond.\u201d Under fluorescent light, diamonds show off their brightness, which can be high, moderate or low. What you want is a well-cut, bright and sparkly diamond.<\/p>\n<div id=\"attachment_245773\" style=\"width: 690px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-245773\" class=\"wp-image-245773\" src=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/19977_main_master.jpg\" alt=\"\" width=\"680\" height=\"680\" srcset=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/19977_main_master.jpg 768w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/19977_main_master-350x350.jpg 350w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/19977_main_master-120x120.jpg 120w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/19977_main_master-300x300.jpg 300w, https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/19977_main_master-216x216.jpg 216w\" sizes=\"(max-width: 680px) 100vw, 680px\" \/><p id=\"caption-attachment-245773\" class=\"wp-caption-text\"><a href=\"https:\/\/www.1stdibs.com\/jewelry\/bracelets\/link-bracelets\/spectacular-46-carat-diamond-bracelet\/id-j_3104163\/\">A 46-carat diamond bracelet, 1940s. Offered by Vivid Diamonds<\/a><\/p><\/div>\n<h2>Carat Weight<\/h2>\n<p>According to the GIA, \u201cDiamonds are weighed to a thousandth (0.001) of a carat and then rounded to the nearest hundredth, or point. Over a carat, diamond weights are usually expressed in carats and decimals.\u201d Out of all the 4Cs, the weight of the diamond is the most scientific and less a matter of opinion. But the weight is also not the most important signifier of a stone\u2019s value. A three-carat gem can be less valuable then a one-carat stone, for example, if all of the other attributes are of lesser quality in the larger diamond. So remember that, while everyone seems to want a larger stone, in the end, bigger does not mean better.<\/p>\n\t<div class=\"interstitial-banner interstitial-banner-collection interstitial-container\">\n\t\t<div class=\"interstitial-content\">\n\t\t\t<div class=\"interstitial-background-image\">\n\t\t\t\t<img decoding=\"async\" width=\"768\" height=\"300\" src=\"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3157683_master-768x300.jpg\" class=\"attachment-interstitial size-interstitial\" alt=\"\" \/>\t\t\t<\/div>\n\t\t\t<div class=\"container interstitial-text\">\n\t\t\t\t<a class=\"interstitial-link-around-text\" href=\"https:\/\/www.1stdibs.com\/jewelry\/stone\/diamond\/\" target=\"_blank\" rel=\"noopener\">\n\t\t\t\t\t<div class=\"interstitial-heading\">\n\t\t\t\t\t\tBrowse More Diamond Jewelry\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"interstitial-subheading\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/a>\n\t\t\t\t<a class=\"gold-button\" href=\"https:\/\/www.1stdibs.com\/jewelry\/stone\/diamond\/\" target=\"_blank\" rel=\"noopener\">\n\t\t\t\t\t<span>Shop All<\/span>\n\t\t\t\t<\/a>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":246393,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"apple_news_api_created_at":"","apple_news_api_id":"","apple_news_api_modified_at":"","apple_news_api_revision":"","apple_news_api_share_url":"","apple_news_cover_media_provider":"image","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_cover_video_id":0,"apple_news_cover_video_url":"","apple_news_cover_embedwebvideo_url":"","apple_news_is_hidden":"","apple_news_is_paid":"","apple_news_is_preview":"","apple_news_is_sponsored":"","apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":[],"apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[15523143],"tags":[15532433,15532463,15532453,332923,15532443,134,3433553,136,15532473,8332323,9772243,4476543,9772253,15532533,15532483,15532563,15532543,15532553,15532523,14971833,15532513,12798323,15532493,15532503],"dibs-categories":[15565908,15565903,15565907],"dibs-designs":[],"dibs-styles":[],"dibs-creators":[],"dibs-sellers":[],"class_list":["post-244793","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-jewelry-2","tag-4cs","tag-carat-weight","tag-clarity","tag-color","tag-cut","tag-diamond","tag-diamonds","tag-emerald","tag-flawless","tag-gem","tag-gemological-institute-of-america","tag-gemstone","tag-gia","tag-heart","tag-internally-flawless","tag-marquis","tag-oval","tag-pear","tag-princess","tag-round","tag-slightly-included","tag-stone","tag-very","tag-very-slightly","dibs-categories-dibs-j_rin_eng","dibs-categories-dibs-j","dibs-categories-dibs-j_rin"],"acf":{"post_format":"article","subtitle":"Read our primer on how jewelers rate the value and quality of diamonds. With these precious gemstones, it's not all about size.","interstitial_banners":[{"acf_fc_layout":"collection","interstitial_banner_shortcode":"diamondjewelry","interstitial_banner_background_image":245753,"interstitial_banner_heading":"Browse More Diamond Jewelry","interstitial_banner_subheading":"","interstitial_banner_button_text":"Shop All","interstitial_banner_button_url":"https:\/\/www.1stdibs.com\/jewelry\/stone\/diamond\/"},{"acf_fc_layout":"collection","interstitial_banner_shortcode":"","interstitial_banner_background_image":false,"interstitial_banner_heading":"","interstitial_banner_subheading":"","interstitial_banner_button_text":"Shop All","interstitial_banner_button_url":""}],"show_date":false,"show_related_items_footer_popup":false,"slideshows":false,"contributors":{"hide_byline":false,"columnist":[{"ID":361858,"post_author":"1","post_date":"2021-12-14 22:36:15","post_date_gmt":"2021-12-15 03:36:15","post_content":"","post_title":"1stDibs Editors","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"1stdibs-editors","to_ping":"","pinged":"","post_modified":"2021-12-14 22:36:15","post_modified_gmt":"2021-12-15 03:36:15","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.1stdibs.com\/blogs\/the-study\/contributors\/1stdibs-editors\/","menu_order":0,"post_type":"contributors","post_mime_type":"","comment_count":"0","filter":"raw"}],"photographer":"","custom_byline":false}},"dibs_designs_tags":null,"dibs_sellers_tags":null,"dibs_creators_tags":null,"dibs_styles_tags":null,"dibs_categories_tags":["dibs-j_rin_eng","dibs-j","dibs-j_rin"],"featured_image_url":"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master-640x450.jpg","post_title":"What Are the &#8216;4 Cs&#8217; of Grading Diamonds?","fimg_url":{"thumbnail":{"source_url":"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master-120x120.jpg","width":120,"height":120},"medium":{"source_url":"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master-350x350.jpg","width":350,"height":350},"full":{"source_url":"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master.jpg","width":768,"height":768}},"jetpack_featured_media_url":"https:\/\/www.1stdibs.com\/blogs\/the-study\/wp-content\/uploads\/3150473_master.jpg","apple_news_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Are the &#039;4 Cs&#039; of Grading Diamonds? | The Study<\/title>\n<meta name=\"description\" content=\"Read our primer on how jewelers rate the value and quality of diamonds. 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