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Cushion|Lab Grown|IGI

1.56ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG546218813

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG546218813

Diamond specifications and retailer prices

From $213 USD
As of October 28, 2026
Save $1,047 USD (83%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,260 USD at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 1.56ct lab-grown cushion diamond

This 1.56ct 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 LG546218813 or 546218813. Listed at 13 retailers as of October 28, 2026, with prices from $213 to $1,260, a $1,047 spread on the same certified stone. Brilliant Earth lists it at $1,260. 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

1.56
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.9°
Pavilion angle31.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG546218813
Dimensions6.49 × 6.37 × 4.23 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
6.49 mm6.37 mm1.56 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG546218813
Side View
Table 61.0%Crown 37.9°Girdle: MED-STKPavilion 31.3°Culet: NoneDepth 66.4%

Caratlytics Score

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

Price History

Last verified: Oct 28
Current: $1,260 USD|Low: $213 USD|High: $1,360 USD|Avg: $566 USD|-7.4%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 29, 2026
Retailer 9$213 USD
Retailer 7$237 USD
Retailer 3$320 USD
Retailer 2$391 USD
Retailer 4$429 USD
Retailer 10$474 USD
Retailer 8$572 USD
Retailer 5$599 USD
Retailer 6$1,113 USD
Brilliant Earth$1,260 USD

42 data points across 10 retailers

13 retailers$213 USD to $1,260 USD

A
Cheapest Retailer
-
$213 USD
Final sale: no returns
A
Retailer 2
-
$237 USD
View
B+
Retailer 3
-
$320 USD
View
A
Retailer 4
-
$391 USD
€372 EUR
View
A
Retailer 5
-
$429 USD
£338 GBP
View
A
Retailer 6
-
$474 USD
View
A
Retailer 7
-
$477 USD
View
B+
Retailer 8
-
$572 USD
View
B+
Retailer 9
-
$599 USD
View
B+
Retailer 10
-
$815 USD
View
B
Retailer 11
-
$1,113 USD
£876 GBP
View
B
Retailer 12
-
$1,165 USD
View
Most Expensive
B
Brilliant Earth
10789467A · Oct 28
$1,260 USD
View
12 more retailers have this diamond
Prices start from $213 USDSave up to $1,047 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
1.56ct Cushion
$213 USD