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 $344 USD
£271 GBP
As of November 1, 2026
Save $1,306 USD (79%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,650 USD 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 $344 to $1,650, a $1,306 spread on the same certified stone. Brilliant Earth lists it at $1,650. 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
Color
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: $1,650 USD|Low: $344 USD|High: $2,180 USD|Avg: $863 USD|-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$344 USD
Retailer 4$497 USD
Retailer 7$506 USD
Retailer 9$528 USD
Retailer 6$557 USD
Retailer 10$639 USD
Retailer 8$687 USD
Retailer 12$950 USD
Retailer 3$999 USD
Retailer 2$1,181 USD
Retailer 11$1,199 USD
Brilliant Earth$1,650 USD

15 data points across 12 retailers

12 retailers$344 USD to $1,650 USD

A
Cheapest Retailer
-
$344 USD
£271 GBP
B+
Retailer 2
-
$497 USD
View
A
Retailer 3
-
$506 USD
ZAR 8,178 ZAR
View
A
Retailer 4
-
$528 USD
€503 EUR
View
A
Retailer 5
-
$557 USD
£439 GBP
View
A
Retailer 6
-
$639 USD
View
A
Retailer 7
-
$687 USD
A$1,057 AUD
View
B+
Retailer 8
-
$950 USD
View
B+
Retailer 9
-
$999 USD
View
B+
Retailer 10
-
$1,181 USD
£930 GBP
View
B+
Retailer 11
-
$1,199 USD
View
Most Expensive
B
Brilliant Earth
22163644A · Oct 31
$1,650 USD
View
11 more retailers have this diamond
Prices start from $344 USDSave up to $1,306 USD

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
$344 USD