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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 $2,221 AUD
$1,560 USD
As of November 2, 2026
Save $7,659 AUD (78%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $9,880 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 LG780664167 or 780664167. Listed at 15 retailers as of November 2, 2026, with prices from $2,221 to $9,880, a $7,659 spread on the same certified stone. With Clarity lists it at $9,880. 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
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 2
Current: $2,808 AUD|Low: $2,221 AUD|High: $6,789 AUD|Avg: $4,158 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
November 2, 2026
Retailer 2$2,221 AUD
Retailer 3$2,353 AUD
Retailer 1$2,808 AUD
Retailer 11$2,921 AUD
Retailer 7$3,115 AUD
Retailer 9$3,459 AUD
Retailer 8$3,558 AUD
Retailer 4$5,017 AUD
Retailer 12$5,603 AUD
Retailer 6$5,979 AUD
Retailer 5$6,218 AUD
Retailer 10$6,779 AUD

42 data points across 12 retailers

15 retailers$2,221 AUD to $9,880 AUD

A
Cheapest Retailer
-
$2,221 AUD
$1,560 USD
A
Retailer 2
-
$2,353 AUD
$1,653 USD
View
A
Retailer 3
-
$2,369 AUD
HK$13,000 HKD
View
A
Retailer 4
-
$2,808 AUD
£1,553 GBP
View
B+
Retailer 5
-
$2,921 AUD
$2,052 USD
View
B+
Retailer 6
-
$3,115 AUD
€2,084 EUR
View
B+
Retailer 7
-
$3,459 AUD
$2,430 USD
View
B+
Retailer 8
-
$3,558 AUD
ZAR 40,374 ZAR
View
Retailer 9
-
$5,017 AUD
$3,524 USD
View
Price last confirmed 9 days ago
B
Retailer 10
-
$5,603 AUD
$3,936 USD
View
B
Retailer 11
-
$5,979 AUD
$4,200 USD
View
B
Retailer 12
-
$6,218 AUD
£3,439 GBP
View
B
Retailer 13
-
$6,778 AUD
$4,761 USD
View
Retailer 14
-
$6,779 AUD
View
Price last confirmed 24 days ago
Most Expensive
B
With Clarity
780664167 · Nov 2
$9,880 AUD
$6,940 USD
View
14 more retailers have this diamond
Prices start from $2,221 AUDSave up to $7,659 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
$2,221 AUD