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Round|Lab Grown|IGI

1.78ct I SI2 Round Lab Grown Diamond

ID • I/SI2 • IGI LG490193814

Shape and cutting style on the report: Round brilliant

Certificate IGI LG490193814

Diamond specifications and retailer prices

From £961 GBP
$1,280 USD
As of October 29, 2026
Save £2,655 GBP (73%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £3,616 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 LG490193814 or 490193814. Listed at 10 retailers as of October 25, 2026, with prices from £961 to £3,616, a £2,655 spread on the same certified stone. MOH London lists it at £3,616. 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
SymmetryVery Good
FluorescenceNone
Crown angle33.5°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG490193814
Dimensions7.82 × 7.85 × 4.71 mm
L/W Ratio1.00
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
7.82 mm7.85 mm1.78 ctI / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG490193814
Side View
Table 59.0%Crown 33.5°GirdlePavilion 40.5°Culet: NoneDepth 60.1%

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: £3,616 GBP|Low: £961 GBP|High: £3,655 GBP|Avg: £1,936 GBP|-0.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 25, 2026
Retailer 2£961 GBP
Retailer 4£1,186 GBP
Retailer 5£1,220 GBP
Retailer 7£1,726 GBP
Retailer 3£1,994 GBP
Retailer 6£2,295 GBP
Retailer 8£2,831 GBP
MOH London£3,616 GBP

9 data points across 8 retailers

10 retailers£961 GBP to £3,616 GBP

A
Cheapest Retailer
-
£961 GBP
$1,280 USD
B+
Retailer 2
-
£1,090 GBP
$1,452 USD
View
B+
Retailer 3
-
£1,186 GBP
$1,579 USD
View
B+
Retailer 4
-
£1,220 GBP
$1,625 USD
View
Final sale: no returns
B+
Retailer 5
-
£1,265 GBP
$1,684 USD
View
Retailer 6
-
£1,265 GBP
$1,684 USD
View
Price last confirmed 17 days ago
B
Retailer 7
-
£1,994 GBP
$2,655 USD
View
B
Retailer 8
-
£2,295 GBP
$3,056 USD
View
B
Retailer 9
-
£2,370 GBP
$3,156 USD
View
Most Expensive
B
MOH London
LG490193814 · Oct 25
£3,616 GBP
View
9 more retailers have this diamond
Prices start from £961 GBPSave up to £2,655 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
£961 GBP