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2018年4月26日 · GIA evaluates a round brilliant diamond’s cut based on seven components – brightness, fire, scintillation, weight ratio, durability, polish and symmetry – to arrive at a GIA diamond cut grade, which ranges from Excellent to Poor.
- Diamond Cut: The Wow Factor
There are five cut grades: Excellent (EX), Very Good ...
- Diamond Cut - GIA 4Cs
GIA's diamond cut grading system. Assessing the ...
- GIA Cut Grading System Charts and Booklets
GIA Cut Grade Estimation Tables for Standard Round ...
- GIA Diamond Grading Reports: Understanding Diamond Cut Grades
GIA provides an overall cut grade for standard round ...
- Diamond Cut: The Wow Factor
- The Basics
- Words That Describe Diamond Cut
- Proportions: Everything Works Together
- Diamond Cut: What to Look For
The GIA Cut Grading System applies to the most popular cutting style – the standard round brilliant – and all clarities across the D-to-Z color range. There are five cut grades: Excellent (EX), Very Good (VG), Good (G), Fair (F) and Poor (P). A diamond with an Excellent cut grade is very bright. It shows an even pattern with good contrast between l...
Words like “sparkle,” “fire,” “brightness” and “pattern” are used when talking about a finished diamond’s appearance. You might hear: “Isn’t it beautiful? See how much it sparkles. See how much life this stone has.” There are optical effects that make a beautiful diamond look the way it does; together, they give the diamond life and determine its v...
The whole is greater than the sum when it comes to a diamond’s proportions, which are the dimensions and angles of a polished diamond’s facets and how they relate to one another. There is no set “formula” or set of proportions that result in a perfectly cut diamond. All of the numbers you might have heard other people referring to – table size, cro...
Your eye sees those proportions working together – for better or worse – when you look at a diamond face-up. Dark areas in the center, under the table or around the girdle could mean that the shape of the rough forced some compromise. Conversely, bright, even patterns signify a cutter’s attention to detail and precision. The GIA system downgrades d...
2024年1月19日 · 鑽石顏色（Color）在 4C 標準中為僅次於鑽石切割技術（Cut）的重要評斷項目，因為顏色會直接影響鑽石帶來的視覺感受。 鑽石顏色 Color：不用挑最高級？ 鑽石晶透的5大原則. This picture taken on September 23, 2019, in Paris, shows lab-grown diamonds in the headquarters of the Diam-Concept company.
GIA's diamond cut grading system. Assessing the major components of a diamond, as well as its ability to interact with light, the Diamond Cut Grading System provides a standard system for consistently evaluating and documenting the cut quality of a standard round brilliant diamond from Excellent to Poor.
2024年1月19日 · 鑽石切割是「鑽石 4C」中的一個面向，鑽石 4C 是全球通用的鑽石鑑定標準，將鑽石等級分為：切割 Cut、顏色 Color、淨度 Clarity、克拉重量 Carat 四個面向。 「鑽石切割」是 4C 中影響鑽石外觀最重要的一環，也是 4C 中唯一仰賴人工的因素，透過對稱性、比例及拋光度之間的搭配，能夠最大程度地展現鑽石的亮度、火彩及閃爍。 鑽石淨度Clarity：鑽石淨度等級表與挑選指南. This picture taken on September 23, 2019, in Paris, shows lab-grown diamonds in the headquarters of the Diam-Concept company.
1 天前 · GIA Cut Grade Estimation Tables for Standard Round Brilliant Cut Diamond. Explains how to locate a particular proportion combination, and determine whether it is close to a boundary in the cut grading system. It also discusses how to use Facetware online to obtain a more accurate estimate of a cut grade. Full-color, 8 page booklet.
2015年11月9日 · GIA provides an overall cut grade for standard round brilliant cut diamonds in the D-to-Z color range. The cut grade appears as either: Excellent, Very Good, Good, Fair, or Poor. For a diamond to be graded as ‘Excellent’, the top category, a diamond must exhibit an even pattern of bright and dark areas.
