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Round|Lab Grown|IGI

1.78ct D SI2 Round Lab Grown Diamond

ID • D/SI2 • IGI LG478122782

Shape and cutting style on the report: Round brilliant

Certificate IGI LG478122782

Diamond specifications and retailer prices

From £160 GBP
$213 USD
As of October 29, 2026
Save £721 GBP (82%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £881 GBP at MOH London · As of October 29, 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 D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG478122782 or 478122782. Listed at 7 retailers as of October 29, 2026, with prices from £160 to £881, a £721 spread on the same certified stone. MOH London lists it at £881. 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
D
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG478122782
Dimensions7.74 × 7.71 × 4.83 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.74 mm7.71 mm1.78 ctD / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG478122782
Side View
Table 58.0%Crown 35.2°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 29
Current: £881 GBP|Low: £155 GBP|High: £907 GBP|Avg: £526 GBP|-2.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 9£160 GBP
Retailer 8£185 GBP
Retailer 7£340 GBP
Retailer 2£343 GBP
Retailer 12£438 GBP
Retailer 3£471 GBP
Retailer 11£606 GBP
Retailer 5£639 GBP
Retailer 6£703 GBP
Retailer 10£703 GBP
Retailer 4£849 GBP
MOH London£881 GBP

39 data points across 12 retailers

7 retailers£160 GBP to £881 GBP

A
Cheapest Retailer
-
£160 GBP
$213 USD
A
Retailer 2
-
£185 GBP
$247 USD
View
B+
Retailer 3
-
£340 GBP
$453 USD
View
A
Retailer 4
-
£343 GBP
View
B
Retailer 5
-
£639 GBP
$851 USD
View
B+
Retailer 6
-
£703 GBP
$936 USD
View
Most Expensive
B
MOH London
LG478122782 · Oct 29
£881 GBP
View
6 more retailers have this diamond
Prices start from £160 GBPSave up to £721 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
£160 GBP