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Cushion|Lab Grown|IGI

1.56ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG683597087

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG683597087

Diamond specifications and retailer prices

From HK$3,311 HKD
$422 USD
As of October 28, 2026
Save HK$8,929 HKD (73%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: HK$12,240 HKD 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 LG683597087 or 683597087. Listed at 8 retailers as of October 28, 2026, with prices from HK$3,311 to HK$12,240, a HK$8,929 spread on the same certified stone. Brilliant Earth lists it at HK$12,240. 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
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.2°
Pavilion angle37.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG683597087
Dimensions6.60 × 6.58 × 4.47 mm
L/W Ratio1.00
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
6.60 mm6.58 mm1.56 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG683597087
Side View
Table 62.0%Crown 37.2°Girdle: THN-MEDPavilion 37.1°Culet: NoneDepth 67.9%

Caratlytics Score

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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: HK$12,240 HKD|Low: HK$3,115 HKD|High: HK$12,633 HKD|Avg: HK$5,641 HKD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 29, 2026
Retailer 6HK$3,311 HKD
Retailer 2HK$3,469 HKD
Retailer 3HK$3,633 HKD
Retailer 8HK$3,751 HKD
Retailer 7HK$3,931 HKD
Retailer 5HK$6,905 HKD
Retailer 4HK$8,889 HKD
Brilliant EarthHK$12,240 HKD

41 data points across 8 retailers

8 retailersHK$3,311 HKD to HK$12,240 HKD

B+
Cheapest Retailer
-
HK$3,311 HKD
$422 USD
A
Retailer 2
-
HK$3,469 HKD
£348 GBP
View
A
Retailer 3
-
HK$3,633 HKD
€441 EUR
View
A
Retailer 4
-
HK$3,751 HKD
$478 USD
View
A
Retailer 5
-
HK$3,931 HKD
$501 USD
View
B+
Retailer 6
-
HK$6,905 HKD
$880 USD
View
Price last confirmed 10 days ago
B
Retailer 7
-
HK$8,889 HKD
£892 GBP
View
Most Expensive
B
Brilliant Earth
13446550A · Oct 28
HK$12,240 HKD
$1,560 USD
View
7 more retailers have this diamond
Prices start from HK$3,311 HKDSave up to HK$8,929 HKD

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
HK$3,311 HKD