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Cushion|Lab Grown|IGI

1.55ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG819628565

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG819628565

Diamond specifications and retailer prices

From $208 USD
As of October 28, 2026
Save $223 USD (52%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $431 USD at 77 Diamonds · As of October 29, 2026
View at 77 Diamonds

About this 1.55ct lab-grown cushion diamond

This 1.55ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG819628565 or 819628565. Listed at 2 retailers as of October 28, 2026, with prices from $208 to $431, a $223 spread on the same certified stone. 77 Diamonds lists it at $431. 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

1.55
Carat
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle39.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG819628565
Dimensions6.74 × 6.64 × 4.51 mm
L/W Ratio1.02
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.74 mm6.64 mm1.55 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG819628565
Side View
Table 62.0%Crown 34.3°Girdle: MED-STKPavilion 39.1°Culet: NoneDepth 67.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 28
Current: $431 USD|Low: $208 USD|High: $486 USD|Avg: $413 USD|-9.6%
77 Diamonds
Retailer 2
Retailer 3
October 29, 2026
Retailer 2$208 USD
Retailer 3$410 USD
77 Diamonds$431 USD

36 data points across 3 retailers

2 retailers$208 USD to $431 USD

A
Cheapest Retailer
-
$208 USD
Final sale: no returns
Most Expensive
A
77 Diamonds
CUSTVSEGGT8YGW · Oct 29
$431 USD
£339 GBP
View
1 more retailer has this diamond
Prices start from $208 USDSave up to $223 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
1.55ct Cushion
$208 USD