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Cushion|Lab Grown|IGI

1.64ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG516259346

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG516259346

Diamond specifications and retailer prices

From HK$3,295 HKD
$420 USD
As of October 28, 2026
Save HK$7,342 HKD (69%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: HK$10,638 HKD at Reve Diamonds · As of October 25, 2026
View at Reve Diamonds

About this 1.64ct lab-grown cushion diamond

This 1.64ct 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 LG516259346 or 516259346. Listed at 7 retailers as of October 25, 2026, with prices from HK$3,295 to HK$10,638, a HK$7,342 spread on the same certified stone. Reve Diamonds lists it at HK$10,638. 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

1.64
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle35.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG516259346
Dimensions7.64 × 6.44 × 4.38 mm
L/W Ratio1.19
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
7.64 mm6.44 mm1.64 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG516259346
Side View
Table 60.5%Crown 35.5°Girdle: MED-STKPavilion 35.7°Culet: NoneDepth 64.8%

Caratlytics Score

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

Price History

Last verified: Oct 28
Current: HK$4,618 HKD|Low: HK$2,197 HKD|High: HK$10,638 HKD|Avg: HK$5,374 HKD|+3.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Reve Diamonds
October 27, 2026
Retailer 4HK$2,197 HKD
Retailer 3HK$3,295 HKD
Retailer 6HK$4,229 HKD
Retailer 5HK$4,237 HKD
Retailer 1HK$4,618 HKD
Retailer 2HK$9,795 HKD
Reve DiamondsHK$10,638 HKD

27 data points across 7 retailers

7 retailersHK$3,295 HKD to HK$10,638 HKD

B+
Cheapest Retailer
-
HK$3,295 HKD
$420 USD
A
Retailer 2
-
HK$4,229 HKD
$539 USD
View
A
Retailer 3
-
HK$4,237 HKD
$540 USD
View
A
Retailer 4
-
HK$4,618 HKD
£463 GBP
View
B
Retailer 5
-
HK$8,250 HKD
$1,052 USD
View
B
Retailer 6
-
HK$9,795 HKD
£983 GBP
View
Most Expensive
B
Reve Diamonds
5D6636B77 · Oct 25
HK$10,638 HKD
$1,356 USD
View
6 more retailers have this diamond
Prices start from HK$3,295 HKDSave up to HK$7,342 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
1.64ct Cushion
HK$3,295 HKD