Diamond Cut Grade Chart
The GIA diamond cut grade is based on seven factors.
Diamond cut grade chart. How GIA Cut Grade System WorksThe GIA Cut Grading System for brilliant round diamonds is defined and allocated one of five cut grades. Its a combination of the Marquise shape and the round cut diamond. Stones of this grade are very expensive and seldom used in traditional jewelry.
There are different grading systems to determine a diamond cut however the most common and agreed-upon one is the cut chart created by GIA since its known to be the best diamond certification lab. The quality of the workmanship or craftsmanship that went into aligning and polishing the diamonds facets. When looking at AGS diamonds we recommend only considering Ideal cut diamonds for the best quality.
Cut quality is graded by the AGS as Ideal Excellent Very Good Good Fair or Poor. The cushion diamond cut looks like a pillow cushion with a square cut but the corners are rounded. How is Diamond Cut Graded.
It shows twenty-five example images of round brilliants five in each of the five grade categories and gives their proportion combination values for additional parameters and a short caption about why that diamond belongs in that grade category. Diamond Clarity The Diamond 4Cs August 13 2015. Every diamond certified by the GIA undergoes a thorough independent evaluation.
The AGS diamond cut grade chart also includes an Ideal grade. Represents roughly the top 35 of diamond cut quality. 228 carat with 065 tcw Crescent Moon and 071 tcw Pave Mounting.
How Light Affects a Diamonds Appearance. GIA Diamond Grading Reports. GIA Cut Grading Chart subdivides diamond cut into 5 grades.
GIA Cut Grade Estimation Tables for Standard Round Brilliant Cut Diamonds The following example tables provide guidelines for estimating a GIA Cut Grade for round brilliant diamonds with crown angles between 220 and 400 degrees pavilion angles between 388 and 430 degrees and table sizes between 50 and 67 percent. 208 carat with 150 ratio and 181 tcw Side Oval Diamonds. AGS cut grade chart displayed here is based on light quality proportion and finish of.
221 carat with 148 ratio and 029 tcw pave diamonds. Find a retailer that offers GIA-graded diamonds. Excellent Very Good Good Fair Poor.
The GIA system is based on predictive metrics observation of the diamonds. Diamond cut grading is standardized by both GIA Gemological Institute of America and AGS. Very very slightly included 2.
Here you will learn how GIA diamond grades are established and how those grades affect the diamonds price. Grading scale Use the slider to see cut grade details or view the Cut Grade Chart below. The pear-shaped diamond cut is actually a combination of two other diamonds.
Oval Cut Diamond Ring. Oval Cut Diamond Ring. DIAMOND GRADING CHART CLARITY Internally Flawless Very Very Slightly Included Very Slightly Included Slightly Included Included IF.
Diamonds with low cut grades often appear glassy or dull or just plain small and they dont live up to our standards of great quality at a great value. The 23 color grades on the GIA Color Scale or diamond color chart are subdivided into five subcategories which are. 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.
The ranges for these parame-. The Official GIA Diamond Clarity Scale. 261 carat with 141 ratio in 090 tcw Crescent Moon 3-stone mounting.
Each letter grade has a clearly defined narrow range of color appearance. Brightness fire scintillation weight ratio durability polish and symmetry. Poor Fair Good Very Good and Excellent AKA Ideal cut.
Appearance and computer modeling of diamond appearance. GIA diamond cut grading is based on girdle thickness finish and culet size. Professional gem graders use the following diamond clarity grades.
VVS 1 VVS 2 VS 1 VS 2 SI 1 SI 2 I 1 I 2 I 3 CARAT COLOR D - F Colorless G - J Near Colorless K - M Slightly Tinted N - R Very Light S - Z Light CUT Total Depth Crown Table Width Angle Pavilion Angle Girdle Diameter Crown Height. Astor by Blue Nile PoorFair Cut. Diamond Clarity Chart and Grades.
Understanding Diamond Grading and Cut Grades. This is a classic cut diamond that has existed for nearly 200 years. This 202 carat ct round brilliant has excellent cut polish and symmetry.
Very very slightly included 1. Stones of this grade are very expensive and seldom used in traditional jewelry. Oval Cut Diamond Ring.
This page shows the diamond cut grade chart based on AGS American Gem Society standards. Oval Cut Diamond Ring. Very slightly included 2.
Poor fair good very good and excellent. A GIA Excellent cut will be listed as either Ideal or Super Ideal on the Brilliant Earth site. Uncategorized May 27 2015.
Large format chart 32h x 42w 81 cm x 107 cm Poster - Estimating a Cut Grade low res 13MB Chart - Estimating a Cut.
