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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 $2,226 AUD
$1,560 USD
As of November 2, 2026
Save $7,677 AUD (78%) vs most expensive(unlock to see where)
12 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 LG800681940 or 800681940. Listed at 12 retailers as of November 2, 2026, with prices from $2,226 to $9,903, a $7,677 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
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 2
Current: $2,814 AUD|Low: $2,128 AUD|High: $9,704 AUD|Avg: $4,571 AUD|-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$2,226 AUD
Retailer 8$2,359 AUD
Retailer 1$2,814 AUD
Retailer 5$2,928 AUD
Retailer 2$3,122 AUD
Retailer 4$3,467 AUD
Retailer 9$5,029 AUD
Retailer 3$6,266 AUD
Retailer 6$7,448 AUD
With Clarity$9,704 AUD

41 data points across 10 retailers

12 retailers$2,226 AUD to $9,903 AUD

A
Cheapest Retailer
-
$2,226 AUD
$1,560 USD
A
Retailer 2
-
$2,359 AUD
$1,653 USD
View
A
Retailer 3
-
$2,374 AUD
HK$13,000 HKD
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
Retailer 8
-
$5,029 AUD
$3,524 USD
View
Price last confirmed 9 days ago
B
Retailer 9
-
$6,266 AUD
£3,458 GBP
View
B
Retailer 10
-
$6,794 AUD
$4,761 USD
View
B
Retailer 11
-
$7,448 AUD
$5,220 USD
View
Most Expensive
B
With Clarity
800681940 · Nov 2
$9,903 AUD
$6,940 USD
View
11 more retailers have this diamond
Prices start from $2,226 AUDSave up to $7,677 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
$2,226 AUD