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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 £1,374 GBP
$1,830 USD
As of October 28, 2026
Save £3,763 GBP (73%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £7,527 GBP at With Clarity · As of October 28, 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 27, 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 28
Current: £2,069 GBP|Low: £1,572 GBP|High: £4,236 GBP|Avg: £2,770 GBP|-0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 29, 2026
Retailer 2£1,572 GBP
Retailer 7£1,862 GBP
Retailer 1£2,069 GBP
Retailer 9£2,209 GBP
Retailer 5£2,332 GBP
Retailer 4£2,691 GBP
Retailer 10£2,816 GBP
Retailer 8£2,851 GBP
Retailer 3£3,823 GBP
Retailer 11£3,945 GBP
Retailer 6£4,203 GBP

41 data points across 11 retailers

15 retailers£1,374 GBP to £5,137 GBP

A
Cheapest Retailer
-
£1,374 GBP
$1,830 USD
A
Retailer 2
-
£1,572 GBP
$2,094 USD
View
B+
Retailer 3
-
£1,788 GBP
HK$18,600 HKD
View
B+
Retailer 4
-
£1,862 GBP
$2,480 USD
View
B+
Retailer 5
-
£2,069 GBP
View
B+
Retailer 6
-
£2,209 GBP
$2,942 USD
View
B+
Retailer 7
-
£2,332 GBP
€2,957 EUR
View
B+
Retailer 8
-
£2,691 GBP
ZAR 57,894 ZAR
View
B
Retailer 9
-
£2,816 GBP
$3,750 USD
View
B
Retailer 10
-
£2,851 GBP
A$5,841 AUD
View
Price last confirmed 21 days ago
B
Retailer 11
-
£3,823 GBP
$5,091 USD
View
B
Retailer 12
-
£3,945 GBP
$5,253 USD
View
B
Retailer 13
-
£4,203 GBP
View
B
Retailer 14
-
£5,137 GBP
$6,841 USD
View
Most Expensive
B
With Clarity
780664014 · Oct 28
£7,527 GBP
$10,024 USD
View
Price under review
14 more retailers have this diamond
Prices start from £1,374 GBPSave up to £3,763 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
£1,374 GBP