CaratHunter
Plans
Cushion|Lab Grown|IGI

1.78ct E SI2 Cushion Lab Grown Diamond

ID • E/SI2 • IGI LG528241043

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG528241043

Diamond specifications and retailer prices

From HK$1,915 HKD
$244 USD
As of October 29, 2026
Save HK$7,501 HKD (80%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: HK$9,416 HKD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.78ct lab-grown cushion diamond

This 1.78ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG528241043 or 528241043. Listed at 10 retailers as of October 29, 2026, with prices from HK$1,915 to HK$9,416, a HK$7,501 spread on the same certified stone. Brilliant Earth lists it at HK$9,416. 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

1.78
Carat
E
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle35.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG528241043
Dimensions7.11 × 6.91 × 4.44 mm
L/W Ratio1.03
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
7.11 mm6.91 mm1.78 ctE / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG528241043
Side View
Table 62.5%Crown 35°Girdle: MED-THKPavilion 35.6°Culet: NoneDepth 64.3%

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 29
Current: HK$9,416 HKD|Low: HK$1,915 HKD|High: HK$9,730 HKD|Avg: HK$4,700 HKD|-3.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 4HK$1,915 HKD
Retailer 5HK$2,119 HKD
Retailer 8HK$2,982 HKD
Retailer 3HK$3,576 HKD
Retailer 2HK$3,930 HKD
Retailer 7HK$4,166 HKD
Retailer 10HK$4,564 HKD
Retailer 9HK$4,786 HKD
Retailer 6HK$8,500 HKD
Brilliant EarthHK$9,416 HKD

39 data points across 10 retailers

10 retailersHK$1,915 HKD to HK$9,416 HKD

A
Cheapest Retailer
-
HK$1,915 HKD
$244 USD
Final sale: no returns
A
Retailer 2
-
HK$2,119 HKD
$270 USD
View
B+
Retailer 3
-
HK$2,982 HKD
$380 USD
View
A
Retailer 4
-
HK$3,576 HKD
€434 EUR
View
A
Retailer 5
-
HK$3,930 HKD
£394 GBP
View
A
Retailer 6
-
HK$4,166 HKD
$531 USD
View
A
Retailer 7
-
HK$4,564 HKD
$582 USD
View
B+
Retailer 8
-
HK$4,786 HKD
$610 USD
View
B
Retailer 9
-
HK$8,500 HKD
£853 GBP
View
Most Expensive
B
Brilliant Earth
17664345A · Oct 29
HK$9,416 HKD
$1,200 USD
View
9 more retailers have this diamond
Prices start from HK$1,915 HKDSave up to HK$7,501 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
1.78ct Cushion
HK$1,915 HKD