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Round|Lab Grown|IGI

1.78ct I SI2 Round Lab Grown Diamond

ID • I/SI2 • IGI LG470149591

Shape and cutting style on the report: Round brilliant

Certificate IGI LG470149591

Diamond specifications and retailer prices

From £253 GBP
$337 USD
As of October 29, 2026
Save £1,103 GBP (81%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,356 GBP at MOH London · As of October 25, 2026
View at MOH London

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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG470149591 or 470149591. Listed at 15 retailers as of October 25, 2026, with prices from £253 to £1,356, a £1,103 spread on the same certified stone. MOH London lists it at £1,356. 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
I
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG470149591
Dimensions7.77 × 7.82 × 4.80 mm
L/W Ratio1.01
Girdle conditionFaceted
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
7.77 mm7.82 mm1.78 ctI / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG470149591
Side View
Table 57.0%Crown 35.2°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: £1,356 GBP|Low: £253 GBP|High: £1,361 GBP|Avg: £662 GBP|-0.4%
MOH London
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
October 29, 2026
Retailer 11£253 GBP
Retailer 8£294 GBP
Retailer 7£314 GBP
Retailer 13£314 GBP
Retailer 5£368 GBP
Retailer 2£408 GBP
Retailer 9£571 GBP
Retailer 4£582 GBP
Retailer 14£612 GBP
Retailer 6£644 GBP
Retailer 10£921 GBP
Retailer 3£1,016 GBP
Retailer 12£1,114 GBP
MOH London£1,356 GBP

13 data points across 14 retailers

15 retailers£253 GBP to £1,356 GBP

A
Cheapest Retailer
-
£253 GBP
$337 USD
A
Retailer 2
-
£294 GBP
$391 USD
View
A
Retailer 3
-
£314 GBP
$418 USD
View
A
Retailer 4
-
£314 GBP
$418 USD
View
B+
Retailer 5
-
£368 GBP
$490 USD
View
A
Retailer 6
-
£408 GBP
View
A
Retailer 7
-
£571 GBP
$760 USD
View
A
Retailer 8
-
£582 GBP
$775 USD
View
A
Retailer 9
-
£612 GBP
$815 USD
View
A
Retailer 10
-
£644 GBP
$857 USD
View
B+
Retailer 11
-
£921 GBP
$1,227 USD
View
B+
Retailer 12
-
£931 GBP
$1,240 USD
View
B+
Retailer 13
-
£1,016 GBP
$1,353 USD
View
B+
Retailer 14
-
£1,114 GBP
$1,484 USD
View
Most Expensive
B+
MOH London
LG470149591 · Oct 25
£1,356 GBP
View
14 more retailers have this diamond
Prices start from £253 GBPSave up to £1,103 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
£253 GBP