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Gemstone grade & description chart
Gemstone Grades and descriptions.
Our Gemstone Grade Chart is easy to use. Here's how.
1. Locate "Gemstone" name.
2. View "Grade" Column for common quick reference grades used in the Jewelry trade.
3. View, "Description (industry standards)", terms used in the Gem Trade in Grading a gemstone.
4. Click any "AGTA Code" in chart to view it's description or click AGTA Codes (Gemstone Enhancements) in table on right.
Gemstone | Grade | Description (industry standards) |
AGTA |
Alexandrite |
A |
Light green to greenish blue, included, weak to low color change. |
O |
Alexandrite |
AA |
Green to greenish blue, slightly included, moderate to medium color change. |
|
Alexandrite |
AAA |
Deeper green to bluish green, clean, bright to high color change. |
|
Amethyst |
B |
Light purple, eye clean to slight imperfections, little or no color zoning, good cut & polish. |
E |
Amethyst |
A |
Med/light purple, eye clean to slight imperfections, little or no color zoning, good cut & polish. |
E |
Amethyst |
A+ |
Med purple, eye clean to slight imperfections, little or no color zoning, good cut. |
E |
Amethyst |
AA |
Med dark to dark purple, eye clean to slight imperfections, little or no color zoning, good cut. |
E |
Amethyst |
AAA |
Deep purple, eye clean to slight imperfections, little or no color zoning, good cut. |
E |
Aquamarine |
B |
Included, light color, good cut. |
H |
Aquamarine | A | Slightly included, medium to light color, good cut. | H |
Aquamarine | AA | Eye clean, medium color, good cut. | H |
Aquamarine | AAA | Eye clean, medium to dark color, good cut. | H |
Bloodstone |
Very Good |
Dark green with red to brownish spots, medium dome cabochon. |
N |
Cameo |
Very Good |
Shell carving, white face on orange to brown background, facing left or right. |
N |
Carnelian |
Very Good |
Orange red to brownish orange, medium dome cabochon. |
D |
Chalcedony |
Very Good |
Medium powder blue, translucent to opaque, medium dome cabochon. |
N |
Chrysoprase |
Very Good |
Medium bright green, translucent to opaque, medium dome cabochon. |
N |
Coral |
Very Good |
Light to medium salmon, “Pink Coral”, good polish, good cut, medium cab. |
N |
Citrine |
A |
Clean, yellow, medium to light, good cut, little or no color zoning. |
H |
Citrine |
AA |
Eye Clean, gold/goldish orange, med to dark, good cut, little or no color zoning. |
H |
Citrine (Palmeira) |
AAA |
Eye Clean, med. golden to yellowish orange, good cut, little or no color zoning. |
H |
CZ, Signity Star | Excellent | Internally clean, perfectly machine cut and polished to ideal conditions. D color of diamonds. High grade cz with more colorful flashes of fire than most diamonds. | SYN |
Diamond |
Note: for diamond grade information visit "Four C's diamond grading chart" in table to your right. |
N | |
Diamond Accents | SI/G-H | Slightly included. G to H color. Good cut. See Four C's for more information. | N |
Emerald |
B |
Light color, included (cloudy), good cut, good polish. |
E |
Emerald |
A |
Medium color, slightly included, good cut, good polish. |
E |
Emerald |
AA |
Medium dark, slightly included, good cut, good polish. |
E |
Emerald | AAA | Very slightly included, med. dark to dark color, brilliance, good cut and polish. | E |
Garnet, Mozambique |
AA |
Eye clean, medium to dark, red to orange brown, good cut. |
N |
Garnet, Rhodolite |
AA |
Eye clean, medium to dark, raspberry to plum, good cut. |
N |
Garnet, Tsavorite |
AA |
Eye clean, light forest green, top brilliance, excellent cut and polish. | N |
Garnet, Tsavorite | AAA | Eye clean, medium forest green, top brilliance, excellent cut and polish. | N |
Garnet, Tsavorite | Gem | Eye clean, dark forest green, top brilliance, excellent cut and polish. | N |
Iolite |
AA |
Med/dark grayish purple, grape color, good cut. |
N |
Jade |
Very Good |
Nephrite Jade, apple to green, medium/dark, good polish, good cut, low cab. |
N |
Lapis |
Very Good |
Med/dark, some gold flakes (Pyrite), even color, good polish, medium dome. |
D |
Moonstone |
Very Good |
Milky, transparent to opaque, medium dome cabochon. |
N |
Opal |
A |
White background, med fire, color range – blue & greens, greens or blue reds. |
N |
Opal, Mexican Fire |
Very Good |
Medium to dark orange, faceted, good cut. |
E |
Pearl, Cultured, Mabe |
Very Good |
White, good luster, good shape. |
ASBL |
Pearl, White Cultured |
A |
Very light cream to pinkish white to white, minor blemishes, very good luster. |
E |
Pearl, Cultured, South Sea |
AA |
Clean, good shape, good luster, (color range: white, pinkish or cream). |
N |
Pearl, Black Cultured |
AA |
Medium gray to black, minor blemishes, very good luster. |
D |
Pearl, Black Cultured, South Sea |
AA |
Medium gray to black, minor blemishes, very good luster, near round to round. |
N |
Pearl, Freshwater |
Very Good |
Very light cream to pinkish white to white, minor blemishes, very good luster. |
E |
Pearl, Black Freshwater |
Very Good |
Varying hues of black, minor blemishes, very good luster. |
D |
Pearl Strand, Cultured |
AA |
Very light cream to grayish white, minimal blemishes, high luster. |
E |
Pearl Strand, Cultured |
AA |
Very light cream to pinkish white, few blemishes, very good luster. |
E |
Pearl Strand, Cultured |
AA |
Very light cream to yellowish white, minimal blemishes, medium luster. |
E |
Pearl Strand, Freshwater |
Very Good |
Very light cream to grayish white, minimal blemishes, high luster, spherical shape. |
E |
Pearl Strand, Freshwater |
Very Good |
Very light cream to yellowish white, minimal blemishes, high luster, spherical shape. |
E |
Onyx, Black |
Very Good |
Black, good polish, good cut. |
D |
Padparadscha, Lab Created | Gem | Eye clean, very clear, very bright orange, good cut/polish. | SYN |
Peridot |
AA |
Eye clean, medium to dark, slightly yellowish green, good cut. |
N |
Smoky Quartz |
AA |
Eye clean, color ranges from medium light (tan) to med dark (brown), good cut. |
E |
Ruby |
B |
Included, light pinkish red, good cut, good polish. |
H |
Ruby | A | Slightly included medium pinkish red, good cut, good polish. | H |
Ruby |
A+ |
Eye clean, medium dark pinkish red, good cut, good polish. |
H |
Ruby |
AA |
Eye clean, medium dark pinkish red, brilliance, good cut, good polish. |
H |
Ruby |
AAA |
Eye clean, medium dark pinkish red to red, brilliance, excellent cut and polish. |
H |
Sapphire, Blue, Lab Created |
Gem |
Eye clean, dark navy blue, good cut/polish and brilliance. |
SYN |
Sapphire, Blue |
A |
Slightly included, med./dark navy, good cut/polish, brilliance. |
H |
Sapphire, Blue |
A+ |
Very slightly included, med. navy, brilliance, good cut/polish. |
H |
Sapphire, Blue |
AA |
Eye clean, med. navy to royal blue, brilliance, good cut/polish. |
H |
Sapphire, Blue |
AAA |
Eye clean, med. navy to royal blue, brilliance, excellent cut/polish. |
H |
Sapphire, Pink | AA | Eye clean, med pink, brilliance, good cut, polish. | H |
Sapphire, Pink | AAA | Eye clean, med to dark pink, brilliance, excellent cut/polish. | H |
Sapphire, Pink, Lab Created | Gem | Eye clean, bright clear pink, high brilliant flashy stone, excellent cut/polish. | SYN |
Star Sapphire, Blue |
AA |
Dark blue, patches of white, good star with light, good polish/cut, med dome. |
H |
Star Sapphire, Black |
AA |
Charcoal gray/dark brown, good star with light, good polish/cut, med dome. |
N |
Sapphire, Yellow |
AA |
Eye clean, medium yellow, brilliance, good cut/polish. |
H |
Sapphire, Yellow | AA | Eye clean, medium to dark yellow, brilliance, excellent cut/polish. | H |
Sapphire, White |
AA |
Eye clean, near colorless, brilliance, good cut, good polish. |
H |
Tanzanite |
B |
Eye clean, light, bluish purple, brilliance, good cut/polish. |
H |
Tanzanite | A | Eye clean, med light, bluish purple, brilliance, good cut/polish. | H |
Tanzanite |
A+ |
Eye clean, med light, bluish purple, brilliance, good cut/polish. |
H |
Tanzanite |
AA |
Eye clean, medium bluish purple, good cut, polish & brilliance. |
H |
Tanzanite |
AAA |
Clean, med dark, bluish purple, brilliance, good cut/polish. |
H |
Tanzanite |
Gem |
Clean, vibrant, med dark, bluish purple, brilliance, good cut/polish. |
H |
Tanzanite, Lab |
Very Good |
Clean, vibrant, dark, blue with violet overtones, brilliance, good cut/polish. |
SYN |
Tiger Eye, Brown |
Very Good |
Golden brown. good cut/polish, med dome. |
E |
Tiger Eye, Honey | Very Good | Golden Honey color, good cut/polish, med dome, good eye. | E |
Green Topaz | Very Good | Medium bluish green, clean, good cut, polish & brilliance. | U |
Glacier Blue Topaz | Very Good | Royal Blue, clean, good cut, polish & brilliance. | U |
London Blue Topaz | AA | Med/dark, clean, good cut, polish & brilliance. | R |
Pink Topaz | Very Good | Pink to rose, clean, good cut, polish & brilliance. | U |
Sky Blue Topaz |
AA |
Eye clean, bright light blue, good cut. |
R |
Swiss Blue Topaz |
AA |
Eye clean, med/dark bright blue, brilliance, good cut/polish. |
R |
Teal Topaz |
Very Good |
Eye clean, bluish green, brilliance, good cut/polish. |
U |
Topaz, Precious | A | Eye clean, light golden color, good cut. | N |
Topaz, Precious | AA | Eye clean, medium golden to slight peach, good cut. | N |
Topaz, Precious |
AAA |
Eye clean, medium/strong golden to peach tones, good cut. |
N |
Topaz, Precious | Imperial | Eye clean, peach to pink color, good cut. | N |
Topaz, White |
Fine |
Signity: Minimal eye visible inclusions, colorless, machine cut. |
H |
Tourmaline, Green |
A |
Eye clean, to slightly included, medium to dark yellowish green, good cut. |
E |
Tourmaline, Green |
AA |
Eye clean, to slightly included, medium yellowish green, good cut. |
E |
Tourmaline, Pink |
AA |
Eye clean, medium color, bright pink, good cut. |
E |
Turquoise |
Very Good |
Bright light blue, no matrix, good cut. |
N |
Blue Zircon |
AA |
Eye clean, medium/dark, slightly greenish blue, good cut. |
H |
Alexandrite, lab simulated |
Very Good |
Eye clean, Violet red with a very slight change to grayish purple, good cut/polish |
SYN |
Chatham Created Alexandrite |
Gem |
Eye clean to very minimal eye visible inclusions, medium/dark greenish blue to medium violet red, good cut. |
SYN |
Chatham Created Emerald |
Fine |
Minimal eye visible inclusions, medium/dark green, good cut. |
SYN |
Chatham Created Emerald |
Gem |
No eye visible inclusions, medium/dark green, good cut. |
SYN |
Chatham Created Padparadscha |
Fine |
Minimal eye visible inclusions, medium/light reddish orange (pink), good cut. |
SYN |
Chatham Created Ruby |
Fine |
Minimal eye visible inclusions, medium/dark blood red, good cut. |
SYN |
Chatham Created Ruby |
Gem |
No eye visible inclusions, medium/dark blood red, good cut. |
SYN |
Chatham Created Sapphire |
Gem |
Very minimal eye inclusion, dark to medium blue, good cut. |
SYN |
Moissanite, White |
Very Good |
Slightly tinted greenish yellow, good cut, very high dispersion. |
SYN |
Moissanite, Green | Light |
Light mint green crystal material, good cut, very high dispersion. |
SYN |
Moissanite, Green | Medium | Dark mint green crystal material, good cut, very high dispersion. | SYN |
Moissanite, Green | Dark | Vibrant dark green crystal material, good cut, very high dispersion. | SYN |
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