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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 $225 USD
As of October 30, 2026
Save $1,255 USD (85%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $1,480 USD 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 $225 to $1,480, a $1,255 spread on the same certified stone. Brilliant Earth lists it at $1,480. 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
Color
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

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: $1,480 USD|Low: $225 USD|High: $1,580 USD|Avg: $655 USD|-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 30, 2026
Retailer 11$225 USD
Retailer 9$251 USD
Retailer 6$340 USD
Retailer 4$413 USD
Retailer 2$461 USD
Retailer 3$508 USD
Retailer 10$588 USD
Retailer 8$643 USD
Retailer 7$1,045 USD
Retailer 5$1,180 USD
Brilliant Earth$1,480 USD

44 data points across 11 retailers

14 retailers$225 USD to $1,480 USD

A
Cheapest Retailer
-
$225 USD
Final sale: no returns
A
Retailer 2
-
$251 USD
View
B+
Retailer 3
-
$340 USD
View
A
Retailer 4
-
$413 USD
€393 EUR
View
A
Retailer 5
-
$461 USD
£363 GBP
View
A
Retailer 6
-
$508 USD
View
A
Retailer 7
-
$572 USD
View
A
Retailer 8
-
$588 USD
View
B+
Retailer 9
-
$643 USD
View
B+
Retailer 10
-
$860 USD
View
Retailer 11
-
$1,045 USD
View
Price last confirmed 8 days ago
B
Retailer 12
-
$1,180 USD
£929 GBP
View
B
Retailer 13
-
$1,201 USD
View
Most Expensive
B
Brilliant Earth
10789223A · Oct 29
$1,480 USD
View
13 more retailers have this diamond
Prices start from $225 USDSave up to $1,255 USD

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
$225 USD