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www.gia.edu › gem-labAnalysis & Grading - GIA.edu

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2024年4月5日 · GIA is the world’s most trusted name in diamond grading and gem identification. With objectivity and expertise as its hallmarks, GIA ensures the integrity and accuracy of every report it issues. GIA tests every material submitted to determine whether it is natural or not, and discloses any treatments discovered during our examination.
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  October 26, 2015 – GIA has updated the list of ...
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  What treatments does GIA test for? Diamonds are ...
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  分析与分级 GIA 是世界上值得信赖的钻石分级和宝石鉴定机构 ...
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  分析とグレーディング GIAはダイヤモンドのグレーディング ...
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  Diamond Grading Report. Full 4Cs assessment with a ...
4cs.gia.edu › en-us › blogGIA Diamond Grading Scales: The Universal Measure of Quality

4cs.gia.edu › en-us › blog
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2013年3月14日 · GIA created the 4Cs (Color, Clarity, Cut and Carat Weight) as a universal method for establishing the quality of any diamond, anywhere in the world. The 4Cs means two very important things: diamond quality can be communicated in a universal language, and diamond-buying consumers can know exactly what they are about to purchase.
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hongkong.gia.edu › ZH-HK › gem-lab-service天然鑽石報告與服務 - Gemological Institute of America

hongkong.gia.edu › ZH-HK › gem-lab-service
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鑽石鑑定精簡版報告(Diamond Dossier ®) 全面的4C評估，包括GIA報告編號鐳射刻字。僅適用於顏色等級為D-Z、重量為0.15-1.99克拉的未鑲嵌天然鑽石。檢視報告範本
www.gia.edu › gem-lab-service › diamond-gradingNatural Diamond Grading Reports & Services

www.gia.edu › gem-lab-service › diamond-grading
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Diamond Grading Report. Full 4Cs assessment with a plotted clarity diagram. For loose, natural D-to-Z color diamonds only, weighing 0.15 carats or more. View Sample Report.
4cs.gia.edu › en-us › how-gia-grades-diamondsGIA Diamond Grading | GIA 4Cs

4cs.gia.edu › en-us › how-gia-grades-diamonds
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In the global diamond industry, a GIA Diamond Grading Report is the benchmark for expert diamond grading. For nearly 100 years, GIA has helped advance the global diamond industry through innovation and education.
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hongkong.gia.edu › ZH-HK › why-gia-grading為什麼要選擇在GIA進行寶石分級和分析？

hongkong.gia.edu › ZH-HK › why-gia-grading
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標準- GIA制訂並維持評估鑽石、有色寶石和珍珠的方法與最佳實踐。作為4C標準和GIA國際鑽石分級系統(International Diamond Grading System )的創立者，我們建立了共同語言以描述D到Z色鑽石的品質。
www.gia.edu › gem-lab-how-gia-grades-diamondHow GIA Grades Diamonds

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4 天前 · GIA provides a cut quality grade only for standard round brilliant diamonds that fall in the GIA D-to-Z color range. After the color and clarity grading process, the diamond’s proportions (measurements and facet angles), along with polish and symmetry descriptions, are used to determine its GIA Cut Grade.
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What is a GIA diamond grading report?
The GIA Diamond Grading Report. This report uses the universally accepted GIA standards to determine a natural diamond’s shape, color, clarity, cut and carat weight – as well as proportions, finish and treatments. It also includes a plotted diagram which maps your diamond, identifying its unique characteristics. The GIA Diamond Origin Report.

GIA Diamond Grading | GIA 4Cs

4cs.gia.edu/en-us/how-gia-grades-diamonds/
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What is a GIA cut grade diamond?
GIA provides a cut quality grade only for standard round brilliant diamonds that fall in the GIA D-to-Z color range. After the color and clarity grading process, the diamond’s proportions (measurements and facet angles), along with polish and symmetry descriptions, are used to determine its GIA Cut Grade.

How GIA Grades Diamonds

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When are GIA diamond grades finalized?
Grading results are finalized once there are sufficient agreeing opinions. GIA provides a cut quality grade only for standard round brilliant diamonds that fall in the GIA D-to-Z color range.

How GIA Grades Diamonds

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What makes Gia a good diamond grading service?
Our clients put their business in our hands and their trust in our expertise – and we are extremely careful with both. Objectivity and independence are the hallmarks of all GIA reports and services, and GIA has elaborate processes in place to ensure a diamond’s anonymity through the grading process.

How GIA Grades Diamonds

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How does Gia evaluate diamonds?
Assessment of color origin and quality based on GIA’s color grading system for diamonds outside the D-to-Z range. Identification of laboratory-grown diamonds, ensuring disclosure through laser inscription and digital-only reports. Confirmation of a gemstone’s identity and characteristics through a full gemological examination.

Analysis & Grading - GIA.edu

www.gia.edu/gem-lab
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How does GIA grading work?
Objectivity and independence are the hallmarks of all GIA reports and services, and GIA has elaborate processes in place to ensure a diamond’s anonymity through the grading process. Upon arrival to the laboratory, every diamond is placed in a custom designed, transparent storage case, and all references to its owner are removed or concealed.

How GIA Grades Diamonds

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