Cushion|Lab Grown|IGI

3.80ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1

Diamond specifications and retailer prices

From $759 USD
£598 GBP
As of October 27, 2026
Save $2,163 USD (74%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $2,922 USD at Blue Nile · As of October 27, 2026
View at Blue Nile

About this 3.8ct lab-grown cushion diamond

This 3.8ct 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. Listed at 2 retailers as of October 27, 2026, with prices from $759 to $2,922, a $2,163 spread on the same certified stone. Blue Nile lists it at $2,922. 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

3.80
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions9.05 × 8.98 × 0.00 mm
L/W Ratio1.01
Top View
9.05 mm8.98 mm3.80 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 61.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 67.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 27
Current: $2,922 USD|Low: $756 USD|High: $2,922 USD|Avg: $1,765 USD
Blue Nile
Retailer 2
October 27, 2026
Retailer 2$759 USD
Blue Nile$2,922 USD

26 data points across 2 retailers

2 retailers$759 USD to $2,922 USD

A
Cheapest Retailer
-
$759 USD
£598 GBP
Most Expensive
B
Blue Nile
23007133 · Oct 27
$2,922 USD
View
1 more retailer has this diamond
Prices start from $759 USDSave up to $2,163 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
3.80ct Cushion
$759 USD