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Marquise|Lab Grown|IGI

1.78ct D IF Marquise Lab Grown Diamond

EX • D/IF • IGI LG780664167

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG780664167

Diamond specifications and retailer prices

From $1,560 USD
As of November 1, 2026
Save $5,380 USD (78%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $6,940 USD at With Clarity · As of November 2, 2026
View at With Clarity

About this 1.78ct lab-grown marquise diamond

This 1.78ct lab-grown marquise sits in the one-and-a-half to two carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780664167 or 780664167. Listed at 15 retailers as of November 1, 2026, with prices from $1,560 to $6,940, a $5,380 spread on the same certified stone. With Clarity lists it at $6,940. 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
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.9°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780664167
Dimensions12.28 × 6.30 × 4.02 mm
L/W Ratio1.95
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
12.28 mm6.30 mm1.78 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780664167
Side View
Table 59.0%Crown 35.9°Girdle: Slightly ThickPavilion 40°Culet: NoneDepth 63.8%

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: Nov 1
Current: $1,972 USD|Low: $1,560 USD|High: $4,769 USD|Avg: $2,921 USD|-1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 2$1,560 USD
Retailer 3$1,653 USD
Retailer 1$1,972 USD
Retailer 11$2,052 USD
Retailer 7$2,188 USD
Retailer 9$2,430 USD
Retailer 8$2,499 USD
Retailer 4$3,524 USD
Retailer 12$3,936 USD
Retailer 6$4,200 USD
Retailer 5$4,368 USD
Retailer 10$4,762 USD

42 data points across 12 retailers

15 retailers$1,560 USD to $6,940 USD

A
Cheapest Retailer
-
$1,560 USD
A
Retailer 2
-
$1,653 USD
View
A
Retailer 3
-
$1,664 USD
HK$13,000 HKD
View
A
Retailer 4
-
$1,972 USD
£1,553 GBP
View
B+
Retailer 5
-
$2,052 USD
View
B+
Retailer 6
-
$2,188 USD
€2,084 EUR
View
B+
Retailer 7
-
$2,430 USD
View
B+
Retailer 8
-
$2,499 USD
ZAR 40,374 ZAR
View
Retailer 9
-
$3,524 USD
View
Price last confirmed 9 days ago
B
Retailer 10
-
$3,936 USD
View
B
Retailer 11
-
$4,200 USD
View
B
Retailer 12
-
$4,368 USD
£3,439 GBP
View
B
Retailer 13
-
$4,761 USD
View
Retailer 14
-
$4,762 USD
A$7,326 AUD
View
Price last confirmed 24 days ago
Most Expensive
B
With Clarity
780664167 · Nov 2
$6,940 USD
View
14 more retailers have this diamond
Prices start from $1,560 USDSave up to $5,380 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 Marquise
$1,560 USD