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Round|Lab Grown|IGI

1.05ct G SI1 Round Lab Grown Diamond

EX • G/SI1 • IGI LG301781204

Shape and cutting style on the report: Round brilliant

Certificate IGI LG301781204

Diamond specifications and retailer prices

From $544 AUD
As of November 6, 2026
Save $227 AUD (29%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $771 AUD at Brilliant Earth · As of November 5, 2026
View at Brilliant Earth

About this 1.05ct lab-grown round diamond

This 1.05ct lab-grown round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG301781204 or 301781204. Listed at 2 retailers as of November 5, 2026, with prices from $544 to $771, a $227 spread on the same certified stone. Brilliant Earth lists it at $771. 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

1.05
Carat
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.9°
Pavilion angle41.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG301781204
Dimensions6.52 × 6.56 × 4.07 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Chemical Vapor Deposition (CVD) laboratory grown diamond is classified as Type IIa
Top View
6.52 mm6.56 mm1.05 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG301781204
Side View
Table 57.0%Crown 33.9°GirdlePavilion 41.7°Culet: NoneDepth 62.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 6
Current: $771 AUD|Low: $446 AUD|High: $771 AUD|Avg: $586 AUD
Brilliant Earth
Retailer 2
Retailer 3
November 6, 2026
Retailer 3$446 AUD
Retailer 2$544 AUD
Brilliant Earth$771 AUD

13 data points across 3 retailers

2 retailers$544 AUD to $771 AUD

B+
Cheapest Retailer
-
$544 AUD
Most Expensive
B
Brilliant Earth
16335929A · Nov 5
$771 AUD
$540 USD
View
1 more retailer has this diamond
Prices start from $544 AUDSave up to $227 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.

B+
1.05ct Round
$544 AUD