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Cushion|Lab Grown|IGI

1.65ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG541252029

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG541252029

Diamond specifications and retailer prices

From £168 GBP
$225 USD
As of October 30, 2026
Save £937 GBP (85%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,105 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.65ct lab-grown cushion diamond

This 1.65ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG541252029 or 541252029. Listed at 14 retailers as of October 29, 2026, with prices from £168 to £1,105, a £937 spread on the same certified stone. Brilliant Earth lists it at £1,105. 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

1.65
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle32.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG541252029
Dimensions6.74 × 6.63 × 4.20 mm
L/W Ratio1.02
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
6.74 mm6.63 mm1.65 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG541252029
Side View
Table 64.0%Crown 34.5°Girdle: MED-VTKPavilion 32.5°Culet: NoneDepth 63.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £1,105 GBP|Low: £168 GBP|High: £1,179 GBP|Avg: £488 GBP|-6.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 11£168 GBP
Retailer 9£187 GBP
Retailer 7£254 GBP
Retailer 5£308 GBP
Retailer 2£341 GBP
Retailer 3£379 GBP
Retailer 10£439 GBP
Retailer 4£454 GBP
Retailer 8£780 GBP
Retailer 6£881 GBP
Brilliant Earth£1,105 GBP

44 data points across 11 retailers

14 retailers£168 GBP to £1,105 GBP

A
Cheapest Retailer
-
£168 GBP
$225 USD
Final sale: no returns
A
Retailer 2
-
£187 GBP
$251 USD
View
B+
Retailer 3
-
£254 GBP
$340 USD
View
A
Retailer 4
-
£308 GBP
€393 EUR
View
A
Retailer 5
-
£341 GBP
View
A
Retailer 6
-
£379 GBP
$508 USD
View
A
Retailer 7
-
£427 GBP
$572 USD
View
A
Retailer 8
-
£439 GBP
$588 USD
View
A
Retailer 9
-
£454 GBP
$608 USD
View
B+
Retailer 10
-
£642 GBP
$860 USD
View
Retailer 11
-
£780 GBP
$1,045 USD
View
Price last confirmed 10 days ago
B
Retailer 12
-
£881 GBP
View
B
Retailer 13
-
£897 GBP
$1,201 USD
View
Most Expensive
B
Brilliant Earth
10789223A · Oct 29
£1,105 GBP
$1,480 USD
View
13 more retailers have this diamond
Prices start from £168 GBPSave up to £937 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
1.65ct Cushion
£168 GBP