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 $727 SGD
$567 USD
As of October 28, 2026
Save $4,144 SGD (85%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $4,870 SGD 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 $727 to $4,870, a $4,144 spread on the same certified stone. Brilliant Earth lists it at $4,870. 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: $4,870 SGD|Low: $727 SGD|High: $5,024 SGD|Avg: $1,969 SGD|-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 4$727 SGD
Retailer 3$805 SGD
Retailer 9$865 SGD
Retailer 13$1,079 SGD
Retailer 2$1,337 SGD
Retailer 6$1,357 SGD
Retailer 7$1,384 SGD
Retailer 12$1,825 SGD
Retailer 5$1,841 SGD
Retailer 10$1,889 SGD
Retailer 8$3,366 SGD
Retailer 11$3,762 SGD
Brilliant Earth$4,870 SGD

41 data points across 13 retailers

16 retailers$727 SGD to $4,870 SGD

A
Cheapest Retailer
-
$727 SGD
$567 USD
Final sale: no returns
A
Retailer 2
-
$805 SGD
$628 USD
View
Price last confirmed 13 days ago
A
Retailer 3
-
$865 SGD
$675 USD
View
A
Retailer 4
-
$1,079 SGD
$842 USD
View
A
Retailer 5
-
$1,337 SGD
£822 GBP
View
A
Retailer 6
-
$1,357 SGD
€1,008 EUR
View
A
Retailer 7
-
$1,384 SGD
ZAR 17,448 ZAR
View
A
Retailer 8
-
$1,825 SGD
$1,424 USD
View
A
Retailer 9
-
$1,841 SGD
$1,436 USD
View
A
Retailer 10
-
$1,889 SGD
A$2,268 AUD
View
Price last confirmed 9 days ago
B+
Retailer 11
-
$2,622 SGD
$2,046 USD
View
B+
Retailer 12
-
$2,785 SGD
$2,173 USD
View
B+
Retailer 13
-
$3,366 SGD
£2,068 GBP
View
B+
Retailer 14
-
$3,762 SGD
$2,935 USD
View
B
Retailer 15
-
$4,383 SGD
$3,420 USD
View
Price last confirmed 21 days ago
Most Expensive
B
Brilliant Earth
21311889A · Oct 29
$4,870 SGD
$3,800 USD
View
15 more retailers have this diamond
Prices start from $727 SGDSave up to $4,144 SGD

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
$727 SGD