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Oval|Lab Grown|IGI

1.78ct F SI1 Oval Lab Grown Diamond

ID • F/SI1 • IGI LG779671606

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG779671606

Diamond specifications and retailer prices

From $300 SGD
$235 USD
As of November 1, 2026
Save $1,349 SGD (82%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $1,649 SGD at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 1.78ct lab-grown oval diamond

This 1.78ct lab-grown oval sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG779671606 or 779671606. Listed at 16 retailers as of October 28, 2026, with prices from $300 to $1,649, a $1,349 spread on the same certified stone. Brilliant Earth lists it at $1,649. 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

1.78
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.1°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG779671606
Dimensions9.51 × 6.71 × 4.36 mm
L/W Ratio1.42
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.51 mm6.71 mm1.78 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG779671606
Side View
Table 62.0%Crown 37.1°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 65.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: $1,649 SGD|Low: $289 SGD|High: $1,700 SGD|Avg: $812 SGD|-3.0%
Brilliant Earth
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
November 1, 2026
Retailer 11$300 SGD
Retailer 3$336 SGD
Retailer 4$349 SGD
Retailer 6$372 SGD
Retailer 12$372 SGD
Retailer 10$483 SGD
Retailer 13$630 SGD
Retailer 7$704 SGD
Retailer 5$804 SGD
Retailer 14$1,197 SGD
Retailer 9$1,202 SGD
Retailer 8$1,374 SGD
Retailer 2$1,492 SGD
Brilliant Earth$1,649 SGD

44 data points across 14 retailers

16 retailers$300 SGD to $1,649 SGD

A
Cheapest Retailer
-
$300 SGD
$235 USD
A
Retailer 2
-
$336 SGD
$263 USD
View
Final sale: no returns
A
Retailer 3
-
$349 SGD
$273 USD
View
Retailer 4
-
$372 SGD
$291 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
$372 SGD
$291 USD
View
Retailer 6
-
$483 SGD
£297 GBP
View
Price last confirmed 17 days ago
B+
Retailer 7
-
$630 SGD
$493 USD
View
A
Retailer 8
-
$704 SGD
£433 GBP
View
A
Retailer 9
-
$795 SGD
$622 USD
View
A
Retailer 10
-
$804 SGD
$629 USD
View
B+
Retailer 11
-
$1,197 SGD
$936 USD
View
B+
Retailer 12
-
$1,202 SGD
$940 USD
View
B+
Retailer 13
-
$1,264 SGD
$989 USD
View
B+
Retailer 14
-
$1,374 SGD
$1,075 USD
View
B+
Retailer 15
-
$1,492 SGD
£919 GBP
View
Most Expensive
B
Brilliant Earth
17997459A · Oct 28
$1,649 SGD
$1,290 USD
View
15 more retailers have this diamond
Prices start from $300 SGDSave up to $1,349 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
1.78ct Oval
$300 SGD