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Cushion|Lab Grown|IGI

3.12ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG653449879

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG653449879

Diamond specifications and retailer prices

From $1,122 AUD
$788 USD
As of October 30, 2026
Save $3,946 AUD (78%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $5,068 AUD at Do Amore Diamonds · As of October 29, 2026
View at Do Amore Diamonds

About this 3.12ct lab-grown cushion diamond

This 3.12ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG653449879 or 653449879. Listed at 5 retailers as of October 29, 2026, with prices from $1,122 to $5,068, a $3,946 spread on the same certified stone. Do Amore Diamonds lists it at $5,068. 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

3.12
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG653449879
Dimensions8.55 × 8.44 × 5.61 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.55 mm8.44 mm3.12 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG653449879
Side View
Table 61.0%Crown 34.5°Girdle: THN-MEDPavilion 40.1°Culet: NoneDepth 66.5%

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 30
Current: $5,068 AUD|Low: $897 AUD|High: $5,068 AUD|Avg: $2,902 AUD|+3.2%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 29, 2026
Retailer 5$1,122 AUD
Retailer 3$1,125 AUD
Retailer 6$1,508 AUD
Retailer 7$1,997 AUD
Retailer 2$2,884 AUD
Retailer 4$2,890 AUD
Retailer 8$4,427 AUD
Do Amore Diamonds$5,068 AUD

17 data points across 8 retailers

5 retailers$1,122 AUD to $5,068 AUD

B+
Cheapest Retailer
-
$1,122 AUD
$788 USD
A
Retailer 2
-
$1,125 AUD
$790 USD
View
B+
Retailer 3
-
$2,884 AUD
£1,595 GBP
View
B+
Retailer 4
-
$2,890 AUD
$2,030 USD
View
Most Expensive
B
Do Amore Diamonds
27-8CB5ED9B3 · Oct 29
$5,068 AUD
$3,560 USD
View
4 more retailers have this diamond
Prices start from $1,122 AUDSave up to $3,946 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
3.12ct Cushion
$1,122 AUD