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2.8xct GIA Excellent Cut Rounds vs 2.06ct F SI1 Solasfera Size or Sparkle? This tradeoff can vary depending on the exact measurements of crown and pavilion angles. They are also referred to as super ideal cut diamonds:As demonstrated on the table at the top researchers have found that a pavilion angle within the range of 40.6° and 41.0° gives a diamond the most amount of brilliance.The above mentioned diamond proportions are the perfect proportions for round cut diamonds for several reasons.2821 People Have Already Received my Honest and 100% Free Diamond Advice. A seemingly minute change in the pavilion or crown angle can make a big difference to the sparkle, fire and scintillation of a diamond. This article has two sections. These serve as a helpful guideline but in truth, a change in one factor will influence the overall balance of the diamond. This is exactly what you are looking for in a beautiful diamond!Look at the grading report of the diamond to make sure that the crown and pavilion angles also match my suggested proportions. I will be referring specifically to round cut diamonds as these are the ones that are most commonly bought.For one thing, the suggested diamond proportions are even stricter than the proportions demanded by GIA or AGS for the best cut grade! The complexity of diamond cutting and the demand for carat weight yield means that the majority of diamonds on the market are not cut to optimise the unique optical qualities of a diamond, rather they are cut for weight and profit. However, very reputable grading laboratories such as GIA and AGS conducted a ton of research and found out that there is a specific range of many different proportions that a diamond with an excellent light performance can have!So, if for instance the pavilion angle is not within the proposed 40.6° – 41.0° but instead is 42.0° it surely would not make any big difference?Within a certain degree however a slightly too shallow or slightly too steep pavilion angle can be counterbalanced by an appropriate crown angle. The brilliance of a diamond refers to the reflections of white light being returned to the viewer’s eyes. 7:38. This short video explains the GIA cut scale and how GIA classifies round brilliant cut diamonds with a cut grade ranging from Excellent to Poor by factoring in a range of parameters including the diamond’s proportions, culet size, girdle thickness, polish and symmetry descriptions. In my experience I have seen excellent grade diamonds with unacceptable proportions, depth, table, angles etc. For a fair comparison, we’ve chosen the G color grade, SI1 clarity grade and Excellent cut grade for all of the diamonds compared below. Excellent cut diamonds are defined as: ‘Excellent Cut Diamonds provide the highest level of fire and brilliance. In the first section, we will provide our best summarized insights on ideal proportions for round and non-round fancy shape diamonds. In my 15 years as an appraiser, I have seen dull looking triple excellent diamonds and I’ve seen amazingly brilliant old European cut diamonds!