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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 £175 GBP
$235 USD
As of October 29, 2026
Save £787 GBP (82%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £963 GBP 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 £175 to £963, a £787 spread on the same certified stone. Brilliant Earth lists it at £963. 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: Oct 29
Current: £963 GBP|Low: £169 GBP|High: £993 GBP|Avg: £474 GBP|-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£175 GBP
Retailer 3£196 GBP
Retailer 4£204 GBP
Retailer 6£217 GBP
Retailer 12£217 GBP
Retailer 10£282 GBP
Retailer 13£368 GBP
Retailer 7£411 GBP
Retailer 5£469 GBP
Retailer 14£699 GBP
Retailer 9£702 GBP
Retailer 8£802 GBP
Retailer 2£871 GBP
Brilliant Earth£963 GBP

44 data points across 14 retailers

16 retailers£175 GBP to £963 GBP

A
Cheapest Retailer
-
£175 GBP
$235 USD
A
Retailer 2
-
£196 GBP
$263 USD
View
Final sale: no returns
A
Retailer 3
-
£204 GBP
$273 USD
View
Retailer 4
-
£217 GBP
$291 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
£217 GBP
$291 USD
View
Retailer 6
-
£282 GBP
View
Price last confirmed 17 days ago
B+
Retailer 7
-
£368 GBP
$493 USD
View
A
Retailer 8
-
£411 GBP
View
A
Retailer 9
-
£464 GBP
$622 USD
View
A
Retailer 10
-
£469 GBP
$629 USD
View
B+
Retailer 11
-
£699 GBP
$936 USD
View
B+
Retailer 12
-
£702 GBP
$940 USD
View
B+
Retailer 13
-
£738 GBP
$989 USD
View
B+
Retailer 14
-
£802 GBP
$1,075 USD
View
B+
Retailer 15
-
£871 GBP
View
Most Expensive
B
Brilliant Earth
17997459A · Oct 28
£963 GBP
$1,290 USD
View
15 more retailers have this diamond
Prices start from £175 GBPSave up to £787 GBP

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
£175 GBP