Cushion|Lab Grown|IGI

3.99ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG828639975

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG828639975

Diamond specifications and retailer prices

From $1,371 USD
As of October 30, 2026
Save $5,109 USD (79%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $6,480 USD at Do Amore Diamonds · As of October 30, 2026
View at Do Amore Diamonds

About this 3.99ct lab-grown cushion diamond

This 3.99ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG828639975 or 828639975. Listed at 5 retailers as of October 30, 2026, with prices from $1,371 to $6,480, a $5,109 spread on the same certified stone. Do Amore Diamonds lists it at $6,480. 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

3.99
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38.4°
Pavilion angle31.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG828639975
Dimensions11.51 × 8.14 × 5.06 mm
L/W Ratio1.41
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.51 mm8.14 mm3.99 ctE / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG828639975
Side View
Table 66.0%Crown 38.4°Girdle: THK-VTKPavilion 31.4°CuletDepth 62.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 30
Current: $6,480 USD|Low: $1,025 USD|High: $6,480 USD|Avg: $3,175 USD|+4.5%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 30, 2026
Retailer 4$1,228 USD
Retailer 5$1,371 USD
Retailer 3$1,375 USD
Retailer 2$3,519 USD
Do Amore Diamonds$6,480 USD

21 data points across 5 retailers

5 retailers$1,371 USD to $6,480 USD

Retailer 1
-
$1,228 USD
£967 GBP
Price last confirmed 13 days ago
B+
Retailer 2
-
$1,371 USD
View
B+
Retailer 3
-
$1,375 USD
View
B
Retailer 4
-
$3,519 USD
£2,771 GBP
View
Most Expensive
B
Do Amore Diamonds
27-6B2432314 · Oct 30
$6,480 USD
View
4 more retailers have this diamond
Prices start from $1,371 USDSave up to $5,109 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+
3.99ct Cushion
$1,371 USD