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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 $303 AUD
$213 USD
As of October 29, 2026
Save $1,367 AUD (82%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $1,670 AUD 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 $303 to $1,670, a $1,367 spread on the same certified stone. MOH London lists it at $1,670. 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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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $1,670 AUD|Low: $295 AUD|High: $1,719 AUD|Avg: $997 AUD|-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$303 AUD
Retailer 8$352 AUD
Retailer 7$645 AUD
Retailer 2$650 AUD
Retailer 12$830 AUD
Retailer 3$892 AUD
Retailer 11$1,149 AUD
Retailer 5$1,211 AUD
Retailer 6$1,332 AUD
Retailer 10$1,332 AUD
Retailer 4$1,608 AUD
MOH London$1,670 AUD

39 data points across 12 retailers

7 retailers$303 AUD to $1,670 AUD

A
Cheapest Retailer
-
$303 AUD
$213 USD
A
Retailer 2
-
$352 AUD
$247 USD
View
B+
Retailer 3
-
$645 AUD
$453 USD
View
A
Retailer 4
-
$650 AUD
£360 GBP
View
B
Retailer 5
-
$1,211 AUD
$851 USD
View
B+
Retailer 6
-
$1,332 AUD
$936 USD
View
Most Expensive
B
MOH London
LG478122782 · Oct 29
$1,670 AUD
£924 GBP
View
6 more retailers have this diamond
Prices start from $303 AUDSave up to $1,367 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
$303 AUD