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Round|Lab Grown|IGI

1.78ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG645443632

Shape and cutting style on the report: Round brilliant

Certificate IGI LG645443632

Diamond specifications and retailer prices

From $254 USD
As of October 28, 2026
Save $848 USD (77%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,102 USD at MOH London · As of October 26, 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG645443632 or 645443632. Listed at 12 retailers as of October 26, 2026, with prices from $254 to $1,102, a $848 spread on the same certified stone. MOH London lists it at $1,102. 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
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG645443632
Dimensions7.81 × 7.76 × 4.77 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.81 mm7.76 mm1.78 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG645443632
Side View
Table 58.0%Crown 33.2°Girdle: MED-STKPavilion 41°Culet: NoneDepth 61.4%

Caratlytics Score

How it works →
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 28
Current: $1,102 USD|Low: $182 USD|High: $1,140 USD|Avg: $579 USD|-2.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 29, 2026
Retailer 8$254 USD
Retailer 9$278 USD
Retailer 6$362 USD
Retailer 2$510 USD
Retailer 10$533 USD
Retailer 4$539 USD
Retailer 5$563 USD
Retailer 7$855 USD
Retailer 3$886 USD
MOH London$1,102 USD

37 data points across 10 retailers

12 retailers$254 USD to $1,102 USD

A
Retailer 1
-
$227 USD
Price last confirmed 30 days ago
A
Retailer 2
-
$254 USD
View
Final sale: no returns
A
Retailer 3
-
$263 USD
View
Price last confirmed 37 days ago
A
Retailer 4
-
$278 USD
View
Price last confirmed 30 days ago
B+
Retailer 5
-
$362 USD
View
A
Retailer 6
-
$510 USD
£401 GBP
View
A
Retailer 7
-
$539 USD
View
A
Retailer 8
-
$563 USD
View
B+
Retailer 9
-
$855 USD
View
B
Retailer 10
-
$886 USD
View
B
Retailer 11
-
$904 USD
View
Price last confirmed 29 days ago
Most Expensive
B
MOH London
LG645443632 · Oct 26
$1,102 USD
£868 GBP
View
11 more retailers have this diamond
Prices start from $254 USDSave up to $848 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
$254 USD