CaratHunter
Plans
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 $399 NZD
$225 USD
As of October 30, 2026
Save $2,227 NZD (85%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $2,626 NZD 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 $399 to $2,626, a $2,227 spread on the same certified stone. Brilliant Earth lists it at $2,626. 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

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $2,626 NZD|Low: $399 NZD|High: $2,803 NZD|Avg: $1,159 NZD|-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$399 NZD
Retailer 9$445 NZD
Retailer 7$603 NZD
Retailer 2$727 NZD
Retailer 4$811 NZD
Retailer 3$902 NZD
Retailer 10$1,043 NZD
Retailer 5$1,079 NZD
Retailer 8$1,854 NZD
Retailer 6$2,093 NZD
Brilliant Earth$2,626 NZD

43 data points across 11 retailers

14 retailers$399 NZD to $2,626 NZD

A
Cheapest Retailer
-
$399 NZD
$225 USD
Final sale: no returns
A
Retailer 2
-
$445 NZD
$251 USD
View
B+
Retailer 3
-
$603 NZD
$340 USD
View
A
Retailer 4
-
$727 NZD
€390 EUR
View
A
Retailer 5
-
$811 NZD
£360 GBP
View
A
Retailer 6
-
$902 NZD
$508 USD
View
A
Retailer 7
-
$1,015 NZD
$572 USD
View
A
Retailer 8
-
$1,043 NZD
$588 USD
View
A
Retailer 9
-
$1,079 NZD
$608 USD
View
B+
Retailer 10
-
$1,526 NZD
$860 USD
View
Retailer 11
-
$1,854 NZD
$1,045 USD
View
Price last confirmed 10 days ago
B
Retailer 12
-
$2,093 NZD
£929 GBP
View
B
Retailer 13
-
$2,131 NZD
$1,201 USD
View
Most Expensive
B
Brilliant Earth
10789223A · Oct 29
$2,626 NZD
$1,480 USD
View
13 more retailers have this diamond
Prices start from $399 NZDSave up to $2,227 NZD

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
$399 NZD