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Round|Lab Grown|IGI

1.20ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG780664327

Shape and cutting style on the report: Round brilliant

Certificate IGI LG780664327

Diamond specifications and retailer prices

From $255 AUD
$179 USD
As of October 30, 2026
Save $1,045 AUD (80%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $1,300 AUD at MOH London · As of October 29, 2026
View at MOH London

About this 1.2ct lab-grown round diamond

This 1.2ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG780664327 or 780664327. Listed at 10 retailers as of October 29, 2026, with prices from $255 to $1,300, a $1,045 spread on the same certified stone. MOH London lists it at $1,300. 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

1.20
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780664327
Dimensions6.93 × 6.88 × 4.09 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
6.93 mm6.88 mm1.20 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780664327
Side View
Table 61.0%Crown 33.4°Girdle: MediumPavilion 40.4°Culet: NoneDepth 59.2%

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: $1,300 AUD|Low: $182 AUD|High: $1,568 AUD|Avg: $779 AUD|-2.7%
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$255 AUD
Retailer 11$280 AUD
Retailer 10$492 AUD
Retailer 7$503 AUD
Retailer 2$543 AUD
Retailer 6$634 AUD
Retailer 12$739 AUD
Retailer 5$940 AUD
Retailer 3$990 AUD
Retailer 8$1,253 AUD
MOH London$1,300 AUD
Retailer 4$1,568 AUD

23 data points across 12 retailers

10 retailers$255 AUD to $1,300 AUD

Retailer 1
-
$228 AUD
$160 USD
Price last confirmed 38 days ago
A
Retailer 2
-
$255 AUD
$179 USD
View
Final sale: no returns
Retailer 3
-
$265 AUD
$186 USD
View
Price last confirmed 38 days ago
B+
Retailer 4
-
$503 AUD
$353 USD
View
B+
Retailer 5
-
$543 AUD
€363 EUR
View
B+
Retailer 6
-
$634 AUD
$445 USD
View
Retailer 7
-
$908 AUD
$638 USD
View
Price last confirmed 33 days ago
B
Retailer 8
-
$940 AUD
$660 USD
View
B
Retailer 9
-
$1,253 AUD
$880 USD
View
Most Expensive
B
MOH London
LG780664327 · Oct 29
$1,300 AUD
£719 GBP
View
9 more retailers have this diamond
Prices start from $255 AUDSave up to $1,045 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
1.20ct Round
$255 AUD