Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG816602405

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

Certificate IGI LG816602405

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: $2,475 USD at Rare Carat · As of October 18, 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 top-tier cut grade and certified by IGI LG816602405 or 816602405. 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. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
D
Color
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.8°
Pavilion angle39.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816602405
Dimensions7.74 × 5.26 × 3.72 mm
L/W Ratio1.47
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
7.74 mm5.26 mm1.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816602405
Side View
Table 62.0%Crown 38.8°Girdle: MediumPavilion 39.4°Culet: NoneDepth 70.7%

Caratlytics Score

How it works →
A+
Exceptional
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: $2,475 USD|Low: $271 USD|High: $3,290 USD|Avg: $1,145 USD|+5.4%
Rare Carat
Retailer 2
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Retailer 10
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Retailer 12
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Retailer 18
October 30, 2026
Retailer 5$271 USD
Retailer 10$306 USD
Retailer 11$338 USD
Retailer 14$499 USD
Retailer 3$683 USD
Retailer 7$769 USD
Retailer 4$786 USD
Retailer 18$835 USD
Retailer 8$895 USD
Retailer 13$956 USD
Retailer 17$960 USD
Retailer 16$1,100 USD
Retailer 6$1,295 USD
Retailer 15$1,312 USD
Retailer 9$1,568 USD
Retailer 2$2,010 USD
Retailer 12$2,290 USD
Rare Carat$2,475 USD

20 data points across 18 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
-
$1,312 USD
£1,033 GBP
View
B
Retailer 7
-
$2,010 USD
View
B
Retailer 8
-
$2,290 USD
View
Most Expensive
Rare Carat
PD-217234 · Oct 18
$2,475 USD
View
Price last confirmed 12 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