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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 $335 AUD
$235 USD
As of November 1, 2026
Save $1,502 AUD (82%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $1,836 AUD at Brilliant Earth · As of November 1, 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 November 1, 2026, with prices from $335 to $1,836, a $1,502 spread on the same certified stone. Brilliant Earth lists it at $1,836. 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: $1,836 AUD|Low: $322 AUD|High: $1,893 AUD|Avg: $903 AUD|-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$335 AUD
Retailer 3$374 AUD
Retailer 4$389 AUD
Retailer 6$414 AUD
Retailer 12$414 AUD
Retailer 10$537 AUD
Retailer 13$702 AUD
Retailer 7$783 AUD
Retailer 5$895 AUD
Retailer 14$1,332 AUD
Retailer 9$1,338 AUD
Retailer 8$1,530 AUD
Retailer 2$1,662 AUD
Brilliant Earth$1,836 AUD

43 data points across 14 retailers

16 retailers$335 AUD to $1,836 AUD

A
Cheapest Retailer
-
$335 AUD
$235 USD
A
Retailer 2
-
$374 AUD
$263 USD
View
Final sale: no returns
A
Retailer 3
-
$389 AUD
$273 USD
View
Retailer 4
-
$414 AUD
$291 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
$414 AUD
$291 USD
View
Retailer 6
-
$537 AUD
£297 GBP
View
Price last confirmed 17 days ago
B+
Retailer 7
-
$702 AUD
$493 USD
View
A
Retailer 8
-
$783 AUD
£433 GBP
View
A
Retailer 9
-
$885 AUD
$622 USD
View
A
Retailer 10
-
$895 AUD
$629 USD
View
B+
Retailer 11
-
$1,332 AUD
$936 USD
View
B+
Retailer 12
-
$1,338 AUD
$940 USD
View
B+
Retailer 13
-
$1,407 AUD
$989 USD
View
B+
Retailer 14
-
$1,530 AUD
$1,075 USD
View
B+
Retailer 15
-
$1,662 AUD
£919 GBP
View
Most Expensive
B
Brilliant Earth
17997459A · Nov 1
$1,836 AUD
$1,290 USD
View
15 more retailers have this diamond
Prices start from $335 AUDSave up to $1,502 AUD

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
$335 AUD