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Marquise|Lab Grown|IGI

1.78ct D IF Marquise Lab Grown Diamond

ID • D/IF • IGI LG800681940

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG800681940

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)
12 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 LG800681940 or 800681940. Listed at 12 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
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG800681940
Dimensions12.40 × 6.31 × 4.05 mm
L/W Ratio1.97
Girdle conditionFaceted
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
12.40 mm6.31 mm1.78 ctD / IF
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateIGI LG800681940
Side View
Table 60.0%Crown 35.1°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 64.2%

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: $1,491 USD|High: $6,801 USD|Avg: $3,203 USD|-1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
With Clarity
November 2, 2026
Retailer 7$1,560 USD
Retailer 8$1,653 USD
Retailer 1$1,972 USD
Retailer 5$2,052 USD
Retailer 2$2,188 USD
Retailer 4$2,430 USD
Retailer 9$3,524 USD
Retailer 3$4,392 USD
Retailer 6$5,220 USD
With Clarity$6,801 USD

41 data points across 10 retailers

12 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
Retailer 8
-
$3,524 USD
View
Price last confirmed 9 days ago
B
Retailer 9
-
$4,392 USD
£3,458 GBP
View
B
Retailer 10
-
$4,761 USD
View
B
Retailer 11
-
$5,220 USD
View
Most Expensive
B
With Clarity
800681940 · Nov 2
$6,940 USD
View
11 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