Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

VG • D/FL • IGI LG815697866

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG815697866

Diamond specifications and retailer prices

From $338 USD
£266 GBP
As of October 30, 2026
Save $1,952 USD (85%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $2,910 USD at Rare Carat · As of October 21, 2026
View at Rare Carat

About this 1.28ct lab-grown radiant diamond

This 1.28ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG815697866 or 815697866. Listed at 9 retailers as of October 30, 2026, with a 578% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.28
Carat
D
Color
FL
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46°
Pavilion angle36.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG815697866
Dimensions7.50 × 5.23 × 3.65 mm
L/W Ratio1.43
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.50 mm5.23 mm1.28 ctD / FL
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG815697866
Side View
Table 70.0%Crown 46°Girdle: MED-STKPavilion 36.8°Culet: NoneDepth 69.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $2,910 USD|Low: $271 USD|High: $3,290 USD|Avg: $1,154 USD|+23.9%
Rare Carat
Retailer 2
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Retailer 4
Retailer 5
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Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
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Retailer 17
October 30, 2026
Retailer 5$271 USD
Retailer 6$306 USD
Retailer 10$338 USD
Retailer 14$499 USD
Retailer 3$683 USD
Retailer 7$769 USD
Retailer 4$786 USD
Retailer 17$835 USD
Retailer 8$895 USD
Retailer 13$956 USD
Retailer 16$960 USD
Retailer 15$1,100 USD
Retailer 11$1,318 USD
Retailer 9$1,568 USD
Retailer 2$2,010 USD
Retailer 12$2,290 USD
Rare Carat$2,910 USD

19 data points across 17 retailers

9 retailers$338 USD to $2,290 USD

A
Cheapest Retailer
-
$338 USD
£266 GBP
A
Retailer 2
-
$499 USD
View
B+
Retailer 3
-
$956 USD
View
Retailer 4
-
$960 USD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$1,100 USD
View
B+
Retailer 6
-
$1,318 USD
£1,038 GBP
View
B
Retailer 7
-
$2,010 USD
View
B
Retailer 8
-
$2,290 USD
View
Most Expensive
Rare Carat
PE1710_l_831604041 · Oct 21
$2,910 USD
View
Price last confirmed 10 days ago
8 more retailers have this diamond
Prices start from $338 USDSave up to $1,952 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.28ct Radiant
$338 USD