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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 $688 SGD
HK$4,200 HKD
As of November 1, 2026
Save $3,558 SGD (84%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $4,246 SGD at Brilliant Earth · As of November 2, 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 November 1, 2026, with prices from $688 to $4,246, a $3,558 spread on the same certified stone. Brilliant Earth lists it at $4,246. 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
Colour
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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $4,246 SGD|Low: $688 SGD|High: $4,246 SGD|Avg: $1,553 SGD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 4$688 SGD
Retailer 12$842 SGD
Retailer 8$897 SGD
Retailer 6$960 SGD
Retailer 2$1,026 SGD
Retailer 5$1,076 SGD
Retailer 10$1,139 SGD
Retailer 9$1,369 SGD
Retailer 11$1,963 SGD
Retailer 3$2,296 SGD
Retailer 7$2,337 SGD
Brilliant Earth$4,246 SGD

43 data points across 12 retailers

13 retailers$688 SGD to $4,246 SGD

A
Cheapest Retailer
-
$688 SGD
HK$4,200 HKD
A
Retailer 2
-
$842 SGD
$658 USD
View
A
Retailer 3
-
$897 SGD
$701 USD
View
A
Retailer 4
-
$960 SGD
€715 EUR
View
A
Retailer 5
-
$1,026 SGD
ZAR 12,965 ZAR
View
B+
Retailer 6
-
$1,076 SGD
£662 GBP
View
A
Retailer 7
-
$1,139 SGD
$891 USD
View
B+
Retailer 8
-
$1,369 SGD
$1,070 USD
View
B+
Retailer 9
-
$1,963 SGD
$1,535 USD
View
B+
Retailer 10
-
$2,296 SGD
$1,795 USD
View
B+
Retailer 11
-
$2,337 SGD
£1,439 GBP
View
Retailer 12
-
$3,006 SGD
$2,350 USD
View
Price last confirmed 74 days ago
Most Expensive
B
Brilliant Earth
20634873A · Nov 2
$4,246 SGD
$3,320 USD
View
12 more retailers have this diamond
Prices start from $688 SGDSave up to $3,558 SGD

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
$688 SGD