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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 $362 AUD
$254 USD
As of October 30, 2026
Save $1,208 AUD (77%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,569 AUD 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 $362 to $1,569, a $1,208 spread on the same certified stone. MOH London lists it at $1,569. 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
Colour
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $1,569 AUD|Low: $259 AUD|High: $1,624 AUD|Avg: $825 AUD|-2.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 8$362 AUD
Retailer 9$396 AUD
Retailer 6$515 AUD
Retailer 2$726 AUD
Retailer 10$759 AUD
Retailer 4$767 AUD
Retailer 5$801 AUD
Retailer 7$1,217 AUD
Retailer 3$1,261 AUD
MOH London$1,569 AUD

38 data points across 10 retailers

12 retailers$362 AUD to $1,569 AUD

Retailer 1
-
$323 AUD
$227 USD
Price last confirmed 31 days ago
A
Retailer 2
-
$362 AUD
$254 USD
View
Final sale: no returns
Retailer 3
-
$374 AUD
$263 USD
View
Price last confirmed 38 days ago
Retailer 4
-
$396 AUD
$278 USD
View
Price last confirmed 31 days ago
B+
Retailer 5
-
$515 AUD
$362 USD
View
A
Retailer 6
-
$726 AUD
£401 GBP
View
A
Retailer 7
-
$767 AUD
$539 USD
View
A
Retailer 8
-
$801 AUD
$563 USD
View
B+
Retailer 9
-
$1,217 AUD
$855 USD
View
B
Retailer 10
-
$1,261 AUD
$886 USD
View
Retailer 11
-
$1,287 AUD
$904 USD
View
Price last confirmed 30 days ago
Most Expensive
B
MOH London
LG645443632 · Oct 26
$1,569 AUD
£868 GBP
View
11 more retailers have this diamond
Prices start from $362 AUDSave up to $1,208 AUD

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
$362 AUD