The reason is this: a well cut diamond will appear larger than a poorly cut diamond. Excellent would be in this case. Before we get into how to go about telling a good cut diamond from a bad cut diamond, let’s first review some facts about diamonds. But because of the excellent cut, it's a beautiful diamond that will sparkle. Polish : Excellent Symmetry : Very Good Cut : Very Good Clarity : VS1 Color : D Fluorescence : None May come in Mounting for Security Reasons Natural Diamond - Mined from Earth. GIA uses a 5 grade hierarchy for cut: Excellent, Very Good, Good, Fair and Poor. I am only interested in GIA Excellent or AGS Ideal cut, and thought that limiting my search to diamonds of that overall cut … The highest Proportion Grade initially started with Very Good followed by Good, Fair and Poor. It shows an even pattern with good contrast between light and dark areas, so the reflections appear crisp and well-balanced. “I’m wondering whether you can shed some light on the differences between AGS Ideal vs GIA Excellent cut diamonds. This will really help me and I really appreciate constructive responses. My diamond is 1.05 Emerald Very Good Cut with G color & IF clarity. So never skimp on it! It reflects most of the light that enters, but not as much as a Very Good cut grade. If you mount them in a ring setting and view them with the naked eye, there will be almost no practical visible difference between the two. As always, cut is the most important, as this is what makes the diamond shine. All of the jewelry stores in my area, seem to only offer diamonds graded by the GIA, IGI, or EGL, and only one seemed to be familiar with the AGS Laboratory.From what I’ve read online, it looks like the AGS & GIA are the most widely recognized. The shape of the diamond plays a large role. Ensure the symmetry and polish of the diamond are either Excellent or Very Good. GIA, considered to be one of the most respected laboratories for grading natural diamonds, uses the following language on their certificates to grade cut for round diamonds: Excellent, Very Good, Good, Fair, Poor. A good cut gives a diamond its brilliance, which is that brightness that seems to come from the very heart of a diamond. Is it OK to go with Very Good Cut instead of Excellent? It reflects nearly as much light as the ideal cut, but for a lower price. Take a look at this 1.07 carats True Hearts diamond and this 1.02 carats Excellent cut diamond – the price difference between them is over $4,000! In 1995, IGI introduced Excellent as the highest cut grade. The exceptions are polish and symmetry, which are assessed using standard GIA grading methodology: A diamond with Very Good polish and/or symmetry, for example, may receive an Excellent cut grade. A depiction of a Brilliant Cut’s facets—including its crown, pavilion and table facets—is displayed in the image below. Whiteflash bridges this gap by bringing to the market GIA Triple Excellent diamonds of exceptional cut craftsmanship. The GIA has five grade levels for cut: Excellent, Very Good, Good, Fair and Poor. Comes with Cert Natural Earth Mined Diamond not Man Made, Lab Created, etc. IN order to decide which grade to give, they analyse the diamond based on three distinct factors, just like the AGS. GIA's Excellent cut-grade is equivalent to an AGSL Ideal grade. Good: This cut represents roughly the top 25% of diamond cut quality. In the first section, we will provide our best summarized insights on ideal proportions for round and non-round fancy shape diamonds. This tells you that the cutter made the best possible use of the rough. 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