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Marquise|Lab Grown|IGI

1.78ct D IF Marquise Lab Grown Diamond

ID • D/IF • IGI LG818655859

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG818655859

Diamond specifications and retailer prices

From $1,653 USD
As of November 2, 2026
Save $5,287 USD (76%) vs most expensive(unlock to see where)
14 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 LG818655859 or 818655859. Listed at 14 retailers as of November 2, 2026, with prices from $1,653 to $6,940, a $5,287 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
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818655859
Dimensions12.21 × 6.24 × 4.04 mm
L/W Ratio1.96
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
12.21 mm6.24 mm1.78 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818655859
Side View
Table 58.0%Crown 37°Girdle: Slightly ThickPavilion 40°Culet: NoneDepth 64.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $1,972 USD|Low: $1,652 USD|High: $6,801 USD|Avg: $3,300 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
With Clarity
November 2, 2026
Retailer 2$1,653 USD
Retailer 3$1,664 USD
Retailer 1$1,972 USD
Retailer 11$2,052 USD
Retailer 7$2,188 USD
Retailer 10$2,430 USD
Retailer 8$2,499 USD
Retailer 12$3,936 USD
Retailer 6$4,200 USD
Retailer 9$4,374 USD
Retailer 5$4,698 USD
Retailer 4$4,761 USD
With Clarity$6,801 USD

43 data points across 13 retailers

14 retailers$1,653 USD to $6,940 USD

A
Cheapest Retailer
-
$1,653 USD
A
Retailer 2
-
$1,664 USD
HK$13,000 HKD
View
A
Retailer 3
-
$1,780 USD
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
B+
Retailer 9
-
$3,936 USD
View
B+
Retailer 10
-
$4,200 USD
View
B+
Retailer 11
-
$4,374 USD
£3,444 GBP
View
B
Retailer 12
-
$4,698 USD
A$7,227 AUD
View
B
Retailer 13
-
$4,761 USD
View
Most Expensive
B
With Clarity
818655859 · Nov 2
$6,940 USD
View
13 more retailers have this diamond
Prices start from $1,653 USDSave up to $5,287 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
$1,653 USD