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Marquise|Lab Grown|IGI

1.78ct E IF Marquise Lab Grown Diamond

EX • E/IF • IGI LG780664014

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG780664014

Diamond specifications and retailer prices

From $2,605 AUD
$1,830 USD
As of October 30, 2026
Save $7,133 AUD (73%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $14,268 AUD at With Clarity · As of October 30, 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 E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780664014 or 780664014. Listed at 15 retailers as of October 30, 2026, with a 274% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.78
Carat
E
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780664014
Dimensions12.38 × 6.33 × 4.01 mm
L/W Ratio1.96
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
12.38 mm6.33 mm1.78 ctE / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780664014
Side View
Table 57.0%Crown 36.5°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 63.3%

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: Oct 30
Current: $3,933 AUD|Low: $2,981 AUD|High: $8,030 AUD|Avg: $5,250 AUD|-0.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 30, 2026
Retailer 2$2,981 AUD
Retailer 7$3,530 AUD
Retailer 1$3,933 AUD
Retailer 9$4,188 AUD
Retailer 5$4,419 AUD
Retailer 4$5,101 AUD
Retailer 10$5,338 AUD
Retailer 8$5,404 AUD
Retailer 3$7,246 AUD
Retailer 11$7,477 AUD
Retailer 6$7,967 AUD

42 data points across 11 retailers

15 retailers$2,605 AUD to $9,738 AUD

A
Cheapest Retailer
-
$2,605 AUD
$1,830 USD
A
Retailer 2
-
$2,981 AUD
$2,094 USD
View
B+
Retailer 3
-
$3,389 AUD
HK$18,600 HKD
View
B+
Retailer 4
-
$3,530 AUD
$2,480 USD
View
B+
Retailer 5
-
$3,933 AUD
£2,176 GBP
View
B+
Retailer 6
-
$4,188 AUD
$2,942 USD
View
B+
Retailer 7
-
$4,419 AUD
€2,957 EUR
View
B+
Retailer 8
-
$5,101 AUD
ZAR 57,894 ZAR
View
B
Retailer 9
-
$5,338 AUD
$3,750 USD
View
Retailer 10
-
$5,404 AUD
View
Price last confirmed 21 days ago
B
Retailer 11
-
$7,246 AUD
$5,091 USD
View
B
Retailer 12
-
$7,477 AUD
$5,253 USD
View
B
Retailer 13
-
$7,967 AUD
£4,407 GBP
View
B
Retailer 14
-
$9,738 AUD
$6,841 USD
View
Most Expensive
With Clarity
780664014 · Oct 30
$14,268 AUD
$10,024 USD
View
Price under review
14 more retailers have this diamond
Prices start from $2,605 AUDSave up to $7,133 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
$2,605 AUD