CaratHunter
Plans
Cushion|Lab Grown|IGI

1.78ct D FL Cushion Lab Grown Diamond

EX • D/FL • IGI LG784646409

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG784646409

Diamond specifications and retailer prices

From $858 USD
As of October 30, 2026
Save $4,332 USD (83%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $5,190 USD at Do Amore Diamonds · As of October 30, 2026
View at Do Amore Diamonds

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 D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG784646409 or 784646409. Listed at 10 retailers as of October 30, 2026, with prices from $858 to $5,190, a $4,332 spread on the same certified stone. Do Amore Diamonds lists it at $5,190. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.78
Carat
D
Color
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle38.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG784646409
Dimensions7.19 × 7.02 × 4.57 mm
L/W Ratio1.02
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
7.19 mm7.02 mm1.78 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG784646409
Side View
Table 64.0%Crown 34.2°Girdle: STK-THKPavilion 38.7°Culet: NoneDepth 65.1%

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 30
Current: $5,190 USD|Low: $649 USD|High: $6,880 USD|Avg: $2,409 USD|-24.6%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 6$858 USD
Retailer 8$870 USD
Retailer 10$908 USD
Retailer 5$1,115 USD
Retailer 9$1,156 USD
Retailer 3$1,290 USD
Retailer 7$2,995 USD
Retailer 4$3,158 USD
Retailer 2$3,680 USD
Do Amore Diamonds$5,190 USD

29 data points across 10 retailers

10 retailers$858 USD to $5,190 USD

A
Cheapest Retailer
-
$858 USD
A
Retailer 2
-
$870 USD
View
A
Retailer 3
-
$908 USD
View
Final sale: no returns
A
Retailer 4
-
$1,115 USD
View
A
Retailer 5
-
$1,156 USD
View
A
Retailer 6
-
$1,290 USD
€1,229 EUR
View
Retailer 7
-
$2,995 USD
View
Price last confirmed 9 days ago
B+
Retailer 8
-
$3,158 USD
£2,487 GBP
View
B
Retailer 9
-
$3,680 USD
View
Most Expensive
B
Do Amore Diamonds
27-543E47EED · Oct 30
$5,190 USD
View
9 more retailers have this diamond
Prices start from $858 USDSave up to $4,332 USD

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
$858 USD