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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 £176 GBP
$234 USD
As of October 28, 2026
Save £1,484 GBP (89%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,660 GBP 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 £176 to £1,660, a £1,484 spread on the same certified stone. Brilliant Earth lists it at £1,660. 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

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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 28
Current: £1,660 GBP|Low: £176 GBP|High: £1,660 GBP|Avg: £498 GBP
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£176 GBP
Retailer 11£195 GBP
Retailer 6£263 GBP
Retailer 5£319 GBP
Retailer 2£359 GBP
Retailer 4£397 GBP
Retailer 9£409 GBP
Retailer 12£450 GBP
Retailer 10£502 GBP
Retailer 7£784 GBP
Retailer 8£792 GBP
Brilliant Earth£1,660 GBP

42 data points across 12 retailers

15 retailers£176 GBP to £1,660 GBP

A
Cheapest Retailer
-
£176 GBP
$234 USD
Final sale: no returns
A
Retailer 2
-
£195 GBP
$260 USD
View
B+
Retailer 3
-
£263 GBP
$350 USD
View
A
Retailer 4
-
£319 GBP
€405 EUR
View
A
Retailer 5
-
£359 GBP
View
A
Retailer 6
-
£397 GBP
$528 USD
View
A
Retailer 7
-
£409 GBP
A$838 AUD
View
A
Retailer 8
-
£435 GBP
$579 USD
View
A
Retailer 9
-
£450 GBP
$599 USD
View
B+
Retailer 10
-
£502 GBP
$669 USD
View
B+
Retailer 11
-
£668 GBP
$889 USD
View
B+
Retailer 12
-
£784 GBP
View
B+
Retailer 13
-
£792 GBP
$1,055 USD
View
Price last confirmed 8 days ago
B
Retailer 14
-
£920 GBP
$1,225 USD
View
Most Expensive
B
Brilliant Earth
10788643A · Oct 28
£1,660 GBP
$2,210 USD
View
14 more retailers have this diamond
Prices start from £176 GBPSave up to £1,484 GBP

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
£176 GBP