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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 $417 NZD
$235 USD
As of November 1, 2026
Save $1,872 NZD (82%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $2,289 NZD 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 $417 to $2,289, a $1,872 spread on the same certified stone. Brilliant Earth lists it at $2,289. 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: $2,289 NZD|Low: $401 NZD|High: $2,360 NZD|Avg: $1,126 NZD|-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 2, 2026
Retailer 11$417 NZD
Retailer 3$467 NZD
Retailer 4$484 NZD
Retailer 6$516 NZD
Retailer 12$516 NZD
Retailer 10$670 NZD
Retailer 13$875 NZD
Retailer 2$976 NZD
Retailer 5$1,116 NZD
Retailer 14$1,661 NZD
Retailer 9$1,668 NZD
Retailer 8$1,907 NZD
Retailer 7$2,071 NZD
Brilliant Earth$2,289 NZD

44 data points across 14 retailers

16 retailers$417 NZD to $2,289 NZD

A
Cheapest Retailer
-
$417 NZD
$235 USD
A
Retailer 2
-
$467 NZD
$263 USD
View
Final sale: no returns
A
Retailer 3
-
$484 NZD
$273 USD
View
Retailer 4
-
$516 NZD
$291 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$516 NZD
$291 USD
View
Retailer 6
-
$670 NZD
£297 GBP
View
Price last confirmed 18 days ago
B+
Retailer 7
-
$875 NZD
$493 USD
View
A
Retailer 8
-
$976 NZD
£433 GBP
View
A
Retailer 9
-
$1,104 NZD
$622 USD
View
A
Retailer 10
-
$1,116 NZD
$629 USD
View
B+
Retailer 11
-
$1,661 NZD
$936 USD
View
B+
Retailer 12
-
$1,668 NZD
$940 USD
View
B+
Retailer 13
-
$1,754 NZD
$989 USD
View
B+
Retailer 14
-
$1,907 NZD
$1,075 USD
View
B+
Retailer 15
-
$2,071 NZD
£919 GBP
View
Most Expensive
B
Brilliant Earth
17997459A · Nov 1
$2,289 NZD
$1,290 USD
View
15 more retailers have this diamond
Prices start from $417 NZDSave up to $1,872 NZD

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
$417 NZD