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Marquise|Lab Grown|IGI

1.78ct G VS1 Marquise Lab Grown Diamond

ID • G/VS1 • IGI LG836666661

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG836666661

Diamond specifications and retailer prices

From $490 AUD
£271 GBP
As of November 1, 2026
Save $1,859 AUD (79%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $2,349 AUD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

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 G colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG836666661 or 836666661. Listed at 12 retailers as of October 31, 2026, with prices from $490 to $2,349, a $1,859 spread on the same certified stone. Brilliant Earth lists it at $2,349. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.78
Carat
G
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG836666661
Dimensions11.86 × 6.55 × 4.04 mm
L/W Ratio1.81
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.86 mm6.55 mm1.78 ctG / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG836666661
Side View
Table 60.0%Crown 34.9°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 61.7%

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 1
Current: $2,349 AUD|Low: $490 AUD|High: $3,103 AUD|Avg: $1,228 AUD|-24.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 5$490 AUD
Retailer 4$708 AUD
Retailer 7$721 AUD
Retailer 9$752 AUD
Retailer 6$794 AUD
Retailer 10$910 AUD
Retailer 8$978 AUD
Retailer 12$1,352 AUD
Retailer 3$1,423 AUD
Retailer 2$1,681 AUD
Retailer 11$1,707 AUD
Brilliant Earth$2,349 AUD

15 data points across 12 retailers

12 retailers$490 AUD to $2,349 AUD

A
Cheapest Retailer
-
$490 AUD
£271 GBP
B+
Retailer 2
-
$708 AUD
$497 USD
View
A
Retailer 3
-
$721 AUD
ZAR 8,178 ZAR
View
A
Retailer 4
-
$752 AUD
€503 EUR
View
A
Retailer 5
-
$794 AUD
£439 GBP
View
A
Retailer 6
-
$910 AUD
$639 USD
View
A
Retailer 7
-
$978 AUD
View
B+
Retailer 8
-
$1,352 AUD
$950 USD
View
B+
Retailer 9
-
$1,423 AUD
$999 USD
View
B+
Retailer 10
-
$1,681 AUD
£930 GBP
View
B+
Retailer 11
-
$1,707 AUD
$1,199 USD
View
Most Expensive
B
Brilliant Earth
22163644A · Oct 31
$2,349 AUD
$1,650 USD
View
11 more retailers have this diamond
Prices start from $490 AUDSave up to $1,859 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
$490 AUD