Diamond Grading Chart: Read Color, Clarity, Cut & Carat
A diamond grading chart explains quality terms. Match its scale to the laboratory report, then compare the stone’s measurements, condition and identification. The chart does not establish a purchase price or an insurance value.
Identify what the chart is showing
Start with the heading and legend. A color scale, a diagram of clarity characteristics and a seller’s price grid answer different questions. Record the laboratory, report type and date before comparing their terminology.
| Field | Read it as | Check separately |
|---|---|---|
| Color | The grade on the stated color scale | Whether the report concerns a D-to-Z or fancy-color diamond |
| Clarity | A grade describing clarity characteristics | The actual stone, plotted features and report comments |
| Cut | A cut-quality grade where the report provides one | Shape, cutting style, polish and symmetry |
| Carat | The stone’s weight | Millimeter measurements and any total-weight wording |
A useful comparison keeps the complete description together. Writing only “one carat, good quality” leaves out the details needed to understand the stone.
Read the D-to-Z color scale
The GIA color guide describes grading under controlled conditions against reference stones. The familiar groupings below are a reading aid; a screen image cannot reproduce those grading conditions.
| Grades | Color group |
|---|---|
| D–F | Colorless |
| G–J | Near colorless |
| K–M | Faint |
| N–R | Very light |
| S–Z | Light |
Use the actual grade on the matching report. Do not assume that everyone sees the same difference between two grades or that a photograph establishes a grade. Fancy-color descriptions need their own context; they should not be forced into this chart.
Decode clarity abbreviations
GIA’s clarity scale has 11 grades and uses examination under 10× magnification. Characteristics are considered by their size, number, position, nature and relief, rather than by counting marks alone.
| Abbreviation | Grade name |
|---|---|
| FL | Flawless |
| IF | Internally Flawless |
| VVS1, VVS2 | Very, Very Slightly Included |
| VS1, VS2 | Very Slightly Included |
| SI1, SI2 | Slightly Included |
| I1, I2, I3 | Included |
“Eye-clean” is not one of these grades. If a seller uses that phrase, ask what viewing conditions it describes and inspect the actual stone. A clarity abbreviation alone is not a promise that a feature will be invisible to you.
Match the chart to the report type
GIA’s sample natural-diamond reports show how quality information is recorded. The overall GIA cut grade applies to standard round brilliant diamonds in the D-to-Z color range; a missing overall cut grade on another shape does not mean that the stone received a poor grade.
Check laboratory-grown documents separately. GIA’s current Laboratory-Grown Diamond Quality Assessment uses Premium or Standard descriptions. Older documents and other report types may use different wording. Read the actual document instead of assuming that one grading chart fits every report.
Keep quality descriptions separate from money
A grade chart is not a quote. GIA explains that it does not provide monetary appraisals or participate in diamond pricing. A retail listing, an insurance replacement value and a buyer’s purchase offer therefore should not be treated as interchangeable amounts.
For a sale, ask what the offer includes: the center diamond, accent stones, setting and any associated jewelry. Bring the existing report and explain repairs or changes you know about. The carat-weight guide helps separate a single stone’s weight from the combined weight in a ring.
Bring the chart questions to your evaluation
Cash 4 Gold & Diamonds buys natural polished diamonds of any size and shape at 617 S. Hill Street, Los Angeles, CA 90014. We do not buy laboratory-grown, uncut or rough diamonds. Review our diamond-buying service and contact us with the item and paperwork you have. Ask for an explanation of the final offer for your actual piece.
Can I grade my diamond from an online chart?
You can learn the terminology and prepare questions. The chart does not replace examination of the stone under the required grading conditions.
Does a report number guarantee the price?
No. A report supplies information about the examined stone. Confirm that it matches your item and ask the buyer to state a separate purchase amount.