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Radiant|Lab Grown|IGI

12.78ct F SI1 Radiant Lab Grown Diamond

ID • F/SI1 • IGI LG591336712

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

Certificate IGI LG591336712

Diamond specifications and retailer prices

From $1,947 SGD
£1,199 GBP
As of November 1, 2026
Save $2,596 SGD (57%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $13,991 SGD at Adiamor · As of November 2, 2026
View at Adiamor

About this 12.78ct lab-grown radiant diamond

This 12.78ct lab-grown radiant sits in the over five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG591336712 or 591336712. Listed at 13 retailers as of November 1, 2026, with a 133% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

12.78
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.8°
Pavilion angle34°
OriginLab Grown
Grading LabIGI
CertificateIGI LG591336712
Dimensions16.82 × 11.37 × 7.51 mm
L/W Ratio1.48
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
16.82 mm11.37 mm12.78 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG591336712
Side View
Table 65.0%Crown 44.8°Girdle: Slightly ThickPavilion 34°Culet: NoneDepth 66.1%

Caratlytics Score

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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: $13,991 SGD|Low: $1,947 SGD|High: $29,255 SGD|Avg: $8,105 SGD|-52.2%
Adiamor
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 2, 2026
Retailer 10$1,947 SGD
Retailer 6$2,090 SGD
Retailer 5$2,274 SGD
Retailer 13$2,424 SGD
Retailer 14$2,640 SGD
Retailer 16$2,847 SGD
Retailer 15$3,195 SGD
Retailer 2$3,407 SGD
Retailer 9$3,812 SGD
Retailer 11$3,848 SGD
Retailer 12$4,179 SGD
Retailer 3$4,543 SGD
Retailer 4$7,779 SGD
Adiamor$13,991 SGD
Retailer 7$26,208 SGD
Retailer 8$26,271 SGD

7 data points across 16 retailers

13 retailers$1,947 SGD to $4,543 SGD

A
Cheapest Retailer
-
$1,947 SGD
£1,199 GBP
A
Retailer 2
-
$2,090 SGD
$1,635 USD
View
A
Retailer 3
-
$2,274 SGD
$1,779 USD
View
A
Retailer 4
-
$2,424 SGD
$1,896 USD
View
A
Retailer 5
-
$2,640 SGD
$2,065 USD
View
B+
Retailer 6
-
$2,847 SGD
HK$17,400 HKD
View
B+
Retailer 7
-
$3,195 SGD
$2,499 USD
View
B+
Retailer 8
-
$3,407 SGD
£2,098 GBP
View
B+
Retailer 9
-
$3,812 SGD
$2,982 USD
View
B
Retailer 10
-
$3,848 SGD
€2,867 EUR
View
B+
Retailer 11
-
$4,179 SGD
$3,269 USD
View
B
Retailer 12
-
$4,543 SGD
$3,554 USD
View
Most Expensive
Adiamor
D-82832577 · Nov 2
$13,991 SGD
$10,944 USD
View
Price under review
12 more retailers have this diamond
Prices start from $1,947 SGDSave up to $2,596 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
12.78ct Radiant
$1,947 SGD