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Cushion|Lab Grown|IGI

1.74ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG526288478

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG526288478

Diamond specifications and retailer prices

From $333 AUD
$234 USD
As of October 28, 2026
Save $2,810 AUD (89%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $3,142 AUD at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 1.74ct lab-grown cushion diamond

This 1.74ct lab-grown cushion 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 LG526288478 or 526288478. Listed at 15 retailers as of October 28, 2026, with prices from $333 to $3,142, a $2,810 spread on the same certified stone. Brilliant Earth lists it at $3,142. 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

1.74
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle31.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG526288478
Dimensions7.05 × 6.86 × 4.23 mm
L/W Ratio1.03
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
7.05 mm6.86 mm1.74 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG526288478
Side View
Table 62.0%Crown 35°Girdle: MED-STKPavilion 31.9°Culet: NoneDepth 61.7%

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 28
Current: $3,142 AUD|Low: $333 AUD|High: $3,142 AUD|Avg: $943 AUD
Brilliant Earth
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 3$333 AUD
Retailer 11$370 AUD
Retailer 5$498 AUD
Retailer 2$605 AUD
Retailer 6$680 AUD
Retailer 4$751 AUD
Retailer 9$775 AUD
Retailer 12$852 AUD
Retailer 10$951 AUD
Retailer 7$1,484 AUD
Retailer 8$1,500 AUD
Brilliant Earth$3,142 AUD

42 data points across 12 retailers

15 retailers$333 AUD to $3,142 AUD

A
Cheapest Retailer
-
$333 AUD
$234 USD
Final sale: no returns
A
Retailer 2
-
$370 AUD
$260 USD
View
B+
Retailer 3
-
$498 AUD
$350 USD
View
A
Retailer 4
-
$605 AUD
€405 EUR
View
A
Retailer 5
-
$680 AUD
£376 GBP
View
A
Retailer 6
-
$751 AUD
$528 USD
View
A
Retailer 7
-
$775 AUD
View
A
Retailer 8
-
$823 AUD
$579 USD
View
A
Retailer 9
-
$852 AUD
$599 USD
View
B+
Retailer 10
-
$951 AUD
$669 USD
View
B+
Retailer 11
-
$1,264 AUD
$889 USD
View
B+
Retailer 12
-
$1,484 AUD
£822 GBP
View
B+
Retailer 13
-
$1,500 AUD
$1,055 USD
View
Price last confirmed 8 days ago
B
Retailer 14
-
$1,741 AUD
$1,225 USD
View
Most Expensive
B
Brilliant Earth
10788643A · Oct 28
$3,142 AUD
$2,210 USD
View
14 more retailers have this diamond
Prices start from $333 AUDSave up to $2,810 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
1.74ct Cushion
$333 AUD