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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 £258 GBP
As of October 30, 2026
Save £974 GBP (79%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,231 GBP at Brilliant Earth · As of October 30, 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 30, 2026, with prices from £258 to £1,231, a £974 spread on the same certified stone. Brilliant Earth lists it at £1,231. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £1,231 GBP|Low: £257 GBP|High: £1,627 GBP|Avg: £647 GBP|-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
October 31, 2026
Retailer 5£258 GBP
Retailer 4£371 GBP
Retailer 6£378 GBP
Retailer 8£394 GBP
Retailer 2£413 GBP
Retailer 10£477 GBP
Retailer 7£513 GBP
Retailer 12£709 GBP
Retailer 3£746 GBP
Retailer 9£886 GBP
Retailer 11£895 GBP
Brilliant Earth£1,231 GBP

14 data points across 12 retailers

12 retailers£258 GBP to £1,231 GBP

A
Cheapest Retailer
-
£258 GBP
B+
Retailer 2
-
£371 GBP
$497 USD
View
A
Retailer 3
-
£378 GBP
ZAR 8,178 ZAR
View
A
Retailer 4
-
£394 GBP
€503 EUR
View
A
Retailer 5
-
£413 GBP
View
A
Retailer 6
-
£477 GBP
$639 USD
View
A
Retailer 7
-
£513 GBP
A$1,057 AUD
View
B+
Retailer 8
-
£709 GBP
$950 USD
View
B+
Retailer 9
-
£746 GBP
$999 USD
View
B+
Retailer 10
-
£886 GBP
View
B+
Retailer 11
-
£895 GBP
$1,199 USD
View
Most Expensive
B
Brilliant Earth
22163644A · Oct 30
£1,231 GBP
$1,650 USD
View
11 more retailers have this diamond
Prices start from £258 GBPSave up to £974 GBP

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
£258 GBP