Cushion|Lab Grown|IGI

0.40ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG670407959

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG670407959

Diamond specifications and retailer prices

From $423 USD
As of October 25, 2026
11 retailers carry this diamond
Most expensive: $644 USD at Taylor and Hart · As of October 21, 2026
View at Taylor and Hart

About this 0.4ct lab-grown cushion diamond

This 0.4ct lab-grown cushion sits in the sub-half-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG670407959 or 670407959. Listed at 11 retailers as of October 25, 2026. 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

0.40
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.4°
Pavilion angle33.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG670407959
Dimensions5.02 × 3.83 × 2.54 mm
L/W Ratio1.31
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
5.02 mm3.83 mm0.40 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG670407959
Side View
Table 61.0%Crown 37.4°Girdle: STK-THKPavilion 33.9°Culet: NoneDepth 66.3%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 25
Current: $281 USD|Low: $112 USD|High: $1,223 USD|Avg: $345 USD|+9.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Taylor and Hart
October 23, 2026
Retailer 12$119 USD
Retailer 13$140 USD
Retailer 2$198 USD
Retailer 8$257 USD
Retailer 11$260 USD
Retailer 7$264 USD
Retailer 1$281 USD
Retailer 4$300 USD
Retailer 5$344 USD
Retailer 6$358 USD
Retailer 3$396 USD
Retailer 9$423 USD
Taylor and Hart$644 USD
Retailer 10$1,223 USD

33 data points across 14 retailers

11 retailers

Retailer 1
-
$140 USD
Price last confirmed 14 days ago
Retailer 2
-
$198 USD
View
Price last confirmed 9 days ago
Retailer 3
-
$260 USD
View
Price last confirmed 8 days ago
Retailer 4
-
$264 USD
£208 GBP
View
Price last confirmed 9 days ago
Retailer 5
-
$281 USD
£221 GBP
View
Price last confirmed 7 days ago
Retailer 6
-
$358 USD
CA$497 CAD
View
Price last confirmed 7 days ago
Retailer 7
-
$396 USD
£312 GBP
View
Price last confirmed 7 days ago
B
Retailer 8
-
$423 USD
View
Retailer 9
-
$644 USD
View
Price last confirmed 9 days ago
Most Expensive
Taylor and Hart
4O9Q8QZ · Oct 21
$644 USD
View
Price last confirmed 9 days ago
9 more retailers have this diamond
Prices start from $423 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.

B
0.40ct Cushion
$423 USD