CaratHunter
Plans
Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG800678621

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

Certificate IGI LG800678621

Diamond specifications and retailer prices

From $538 USD
HK$4,200 HKD
As of October 31, 2026
Save $2,782 USD (84%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $3,320 USD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

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 LG800678621 or 800678621. Listed at 13 retailers as of October 31, 2026, with prices from $538 to $3,320, a $2,782 spread on the same certified stone. Brilliant Earth lists it at $3,320. 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 angle40.2°
Pavilion angle33.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG800678621
Dimensions8.14 × 5.39 × 3.46 mm
L/W Ratio1.51
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
8.14 mm5.39 mm1.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG800678621
Side View
Table 63.0%Crown 40.2°Girdle: MediumPavilion 33.9°Culet: NoneDepth 64.2%

Caratlytics Score

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

Price History

Last verified: Oct 31
Current: $3,320 USD|Low: $538 USD|High: $3,430 USD|Avg: $1,290 USD|-3.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 31, 2026
Retailer 4$538 USD
Retailer 12$658 USD
Retailer 8$701 USD
Retailer 2$751 USD
Retailer 7$800 USD
Retailer 5$841 USD
Retailer 10$891 USD
Retailer 9$1,070 USD
Retailer 11$1,535 USD
Retailer 3$1,795 USD
Retailer 6$1,828 USD
Brilliant Earth$3,320 USD

43 data points across 12 retailers

13 retailers$538 USD to $3,320 USD

A
Cheapest Retailer
-
$538 USD
HK$4,200 HKD
A
Retailer 2
-
$658 USD
View
A
Retailer 3
-
$701 USD
View
A
Retailer 4
-
$751 USD
€715 EUR
View
A
Retailer 5
-
$800 USD
ZAR 12,919 ZAR
View
B+
Retailer 6
-
$841 USD
£662 GBP
View
A
Retailer 7
-
$891 USD
View
B+
Retailer 8
-
$1,070 USD
View
B+
Retailer 9
-
$1,535 USD
View
B+
Retailer 10
-
$1,795 USD
View
B+
Retailer 11
-
$1,828 USD
£1,439 GBP
View
Retailer 12
-
$2,350 USD
View
Price last confirmed 72 days ago
Most Expensive
B
Brilliant Earth
20634873A · Oct 31
$3,320 USD
View
12 more retailers have this diamond
Prices start from $538 USDSave up to $2,782 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
$538 USD