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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 $2,359 AUD
$1,653 USD
As of November 2, 2026
Save $7,544 AUD (76%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $9,903 AUD 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 $2,359 to $9,903, a $7,544 spread on the same certified stone. With Clarity lists it at $9,903. 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
Colour
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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $2,814 AUD|Low: $2,357 AUD|High: $9,704 AUD|Avg: $4,709 AUD|-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$2,359 AUD
Retailer 3$2,374 AUD
Retailer 1$2,814 AUD
Retailer 11$2,928 AUD
Retailer 7$3,122 AUD
Retailer 10$3,467 AUD
Retailer 8$3,566 AUD
Retailer 12$5,616 AUD
Retailer 6$5,993 AUD
Retailer 9$6,241 AUD
Retailer 5$6,703 AUD
Retailer 4$6,794 AUD
With Clarity$9,704 AUD

43 data points across 13 retailers

14 retailers$2,359 AUD to $9,903 AUD

A
Cheapest Retailer
-
$2,359 AUD
$1,653 USD
A
Retailer 2
-
$2,374 AUD
HK$13,000 HKD
View
A
Retailer 3
-
$2,540 AUD
$1,780 USD
View
A
Retailer 4
-
$2,814 AUD
£1,553 GBP
View
B+
Retailer 5
-
$2,928 AUD
$2,052 USD
View
B+
Retailer 6
-
$3,122 AUD
€2,084 EUR
View
B+
Retailer 7
-
$3,467 AUD
$2,430 USD
View
B+
Retailer 8
-
$3,566 AUD
ZAR 40,374 ZAR
View
B+
Retailer 9
-
$5,616 AUD
$3,936 USD
View
B+
Retailer 10
-
$5,993 AUD
$4,200 USD
View
B+
Retailer 11
-
$6,241 AUD
£3,444 GBP
View
B
Retailer 12
-
$6,703 AUD
View
B
Retailer 13
-
$6,794 AUD
$4,761 USD
View
Most Expensive
B
With Clarity
818655859 · Nov 2
$9,903 AUD
$6,940 USD
View
13 more retailers have this diamond
Prices start from $2,359 AUDSave up to $7,544 AUD

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
$2,359 AUD