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Round|Lab Grown|IGI

1.78ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG573372926

Shape and cutting style on the report: Round brilliant

Certificate IGI LG573372926

Diamond specifications and retailer prices

From £157 GBP
$210 USD
As of October 29, 2026
Save £1,530 GBP (91%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,687 GBP at Jared · As of October 28, 2026
View at Jared

About this 1.78ct lab-grown round diamond

This 1.78ct lab-grown round 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 LG573372926 or 573372926. Listed at 11 retailers as of October 28, 2026, with prices from £157 to £1,687, a £1,530 spread on the same certified stone. Jared lists it at £1,687. 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 angle33.8°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG573372926
Dimensions7.78 × 7.83 × 4.74 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.78 mm7.83 mm1.78 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG573372926
Side View
Table 58.5%Crown 33.8°Girdle: MediumPavilion 40.7°Culet: NoneDepth 60.6%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: £866 GBP|Low: £130 GBP|High: £1,545 GBP|Avg: £602 GBP|-1.7%
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
October 29, 2026
Retailer 12£157 GBP
Retailer 13£178 GBP
Retailer 11£182 GBP
Retailer 10£334 GBP
Retailer 6£397 GBP
Retailer 4£420 GBP
Retailer 5£460 GBP
Retailer 3£516 GBP
Retailer 7£628 GBP
Retailer 8£691 GBP
Retailer 1£866 GBP
Retailer 2£1,082 GBP
Retailer 9£1,508 GBP

36 data points across 13 retailers

11 retailers£157 GBP to £1,687 GBP

A
Cheapest Retailer
-
£157 GBP
$210 USD
A
Retailer 2
-
£178 GBP
$238 USD
View
Final sale: no returns
A
Retailer 3
-
£182 GBP
$244 USD
View
B+
Retailer 4
-
£334 GBP
$448 USD
View
A
Retailer 5
-
£397 GBP
View
B+
Retailer 6
-
£628 GBP
$842 USD
View
B+
Retailer 7
-
£691 GBP
$926 USD
View
B
Retailer 8
-
£866 GBP
View
B
Retailer 9
-
£1,082 GBP
$1,450 USD
View
B
Retailer 10
-
£1,508 GBP
$2,020 USD
View
Most Expensive
B
Jared
150062141 · Oct 28
£1,687 GBP
$2,260 USD
View
10 more retailers have this diamond
Prices start from £157 GBPSave up to £1,530 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 Round
£157 GBP