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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 $337 USD
As of October 29, 2026
Save $1,469 USD (81%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,806 USD 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 $337 to $1,806, a $1,469 spread on the same certified stone. MOH London lists it at $1,806. 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
Color
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: $1,806 USD|Low: $337 USD|High: $1,812 USD|Avg: $882 USD|-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$337 USD
Retailer 8$391 USD
Retailer 7$418 USD
Retailer 13$418 USD
Retailer 5$490 USD
Retailer 2$543 USD
Retailer 9$760 USD
Retailer 4$775 USD
Retailer 14$815 USD
Retailer 6$857 USD
Retailer 10$1,227 USD
Retailer 3$1,353 USD
Retailer 12$1,484 USD
MOH London$1,806 USD

13 data points across 14 retailers

15 retailers$337 USD to $1,806 USD

A
Cheapest Retailer
-
$337 USD
A
Retailer 2
-
$391 USD
View
A
Retailer 3
-
$418 USD
View
A
Retailer 4
-
$418 USD
View
B+
Retailer 5
-
$490 USD
View
A
Retailer 6
-
$543 USD
£427 GBP
View
A
Retailer 7
-
$760 USD
View
A
Retailer 8
-
$775 USD
View
A
Retailer 9
-
$815 USD
View
A
Retailer 10
-
$857 USD
View
B+
Retailer 11
-
$1,227 USD
View
B+
Retailer 12
-
$1,240 USD
View
B+
Retailer 13
-
$1,353 USD
View
B+
Retailer 14
-
$1,484 USD
View
Most Expensive
B+
MOH London
LG470149591 · Oct 25
$1,806 USD
£1,422 GBP
View
14 more retailers have this diamond
Prices start from $337 USDSave up to $1,469 USD

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
$337 USD