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Round|Lab Grown|IGI

1.31ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG771657198

Shape and cutting style on the report: Round brilliant

Certificate IGI LG771657198

Diamond specifications and retailer prices

From $336 SGD
As of November 6, 2026
Save $433 SGD (56%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $1,354 SGD at Reve Diamonds · As of October 25, 2026
View at Reve Diamonds

About this 1.31ct lab-grown round diamond

This 1.31ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG771657198 or 771657198. Listed at 17 retailers as of November 5, 2026, with a 129% 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

1.31
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.3°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG771657198
Dimensions7.05 × 7.02 × 4.33 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.05 mm7.02 mm1.31 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG771657198
Side View
Table 58.0%Crown 33.3°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 61.6%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: $427 SGD|Low: $196 SGD|High: $1,490 SGD|Avg: $618 SGD|-18.2%
Retailer 1
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
Retailer 17
Reve Diamonds
November 6, 2026
Retailer 6$201 SGD
Retailer 7$224 SGD
Retailer 15$233 SGD
Retailer 5$250 SGD
Retailer 9$336 SGD
Retailer 1$427 SGD
Retailer 16$434 SGD
Retailer 17$438 SGD
Retailer 14$551 SGD
Retailer 12$634 SGD
Retailer 13$664 SGD
Retailer 11$666 SGD
Retailer 4$672 SGD
Retailer 10$769 SGD
Retailer 3$802 SGD
Retailer 8$871 SGD
Retailer 2$1,166 SGD
Reve Diamonds$1,354 SGD

39 data points across 18 retailers

17 retailers$336 SGD to $769 SGD

Retailer 1
-
$201 SGD
Price last confirmed 11 days ago
Retailer 2
-
$233 SGD
View
Price last confirmed 7 days ago
Retailer 3
-
$250 SGD
View
Price last confirmed 10 days ago
B+
Retailer 4
-
$336 SGD
View
A
Retailer 5
-
$427 SGD
View
Retailer 6
-
$434 SGD
View
Price last confirmed 9 days ago
A
Retailer 7
-
$551 SGD
View
Retailer 8
-
$622 SGD
View
Price last confirmed 16 days ago
A
Retailer 9
-
$634 SGD
View
B+
Retailer 10
-
$664 SGD
View
B+
Retailer 11
-
$666 SGD
View
Retailer 12
-
$672 SGD
View
Price last confirmed 11 days ago
B+
Retailer 13
-
$769 SGD
View
Retailer 14
-
$802 SGD
View
Price last confirmed 13 days ago
Retailer 15
-
$871 SGD
View
Price last confirmed 10 days ago
Retailer 16
-
$1,166 SGD
View
Price last confirmed 11 days ago
Most Expensive
Reve Diamonds
1E17ECC5F · Oct 25
$1,354 SGD
$1,056 USD
View
Price last confirmed 12 days ago
16 more retailers have this diamond
Prices start from $336 SGDSave up to $433 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
1.31ct Round
$336 SGD