CaratHunter
Plans
Cushion|Lab Grown|IGI

1.78ct E IF Cushion Lab Grown Diamond

ID • E/IF • IGI LG674551669

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG674551669

Diamond specifications and retailer prices

From HK$4,449 HKD
$567 USD
As of October 28, 2026
Save HK$25,367 HKD (85%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: HK$29,816 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 IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG674551669 or 674551669. Listed at 16 retailers as of October 28, 2026, with prices from HK$4,449 to HK$29,816, a HK$25,367 spread on the same certified stone. Brilliant Earth lists it at HK$29,816. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.78
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.5°
Pavilion angle38.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG674551669
Dimensions8.20 × 6.42 × 4.48 mm
L/W Ratio1.28
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
8.20 mm6.42 mm1.78 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG674551669
Side View
Table 61.0%Crown 32.5°Girdle: MED-STKPavilion 38.5°Culet: NoneDepth 69.8%

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$29,816 HKD|Low: HK$4,449 HKD|High: HK$30,758 HKD|Avg: HK$12,016 HKD|-3.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 29, 2026
Retailer 4HK$4,449 HKD
Retailer 3HK$4,928 HKD
Retailer 9HK$5,296 HKD
Retailer 13HK$6,607 HKD
Retailer 2HK$8,187 HKD
Retailer 6HK$8,305 HKD
Retailer 7HK$8,474 HKD
Retailer 12HK$11,173 HKD
Retailer 5HK$11,267 HKD
Retailer 10HK$11,567 HKD
Retailer 8HK$20,607 HKD
Retailer 11HK$23,029 HKD
Brilliant EarthHK$29,816 HKD

40 data points across 13 retailers

16 retailersHK$4,449 HKD to HK$29,816 HKD

A
Cheapest Retailer
-
HK$4,449 HKD
$567 USD
Final sale: no returns
Retailer 2
-
HK$4,928 HKD
$628 USD
View
Price last confirmed 13 days ago
A
Retailer 3
-
HK$5,296 HKD
$675 USD
View
A
Retailer 4
-
HK$6,607 HKD
$842 USD
View
A
Retailer 5
-
HK$8,187 HKD
£822 GBP
View
A
Retailer 6
-
HK$8,305 HKD
€1,008 EUR
View
A
Retailer 7
-
HK$8,474 HKD
ZAR 17,448 ZAR
View
A
Retailer 8
-
HK$11,173 HKD
$1,424 USD
View
A
Retailer 9
-
HK$11,267 HKD
$1,436 USD
View
Retailer 10
-
HK$11,567 HKD
A$2,268 AUD
View
Price last confirmed 9 days ago
B+
Retailer 11
-
HK$16,051 HKD
$2,046 USD
View
B+
Retailer 12
-
HK$17,047 HKD
$2,173 USD
View
B+
Retailer 13
-
HK$20,607 HKD
£2,068 GBP
View
B+
Retailer 14
-
HK$23,029 HKD
$2,935 USD
View
Retailer 15
-
HK$26,835 HKD
$3,420 USD
View
Price last confirmed 21 days ago
Most Expensive
B
Brilliant Earth
21311889A · Oct 29
HK$29,816 HKD
$3,800 USD
View
15 more retailers have this diamond
Prices start from HK$4,449 HKDSave up to HK$25,367 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$4,449 HKD