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Marquise|Lab Grown|IGI

1.70ct E IF Marquise Lab Grown Diamond

ID • E/IF • IGI LG818668458

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG818668458

Diamond specifications and retailer prices

From £368 GBP
$490 USD
As of October 30, 2026
Save £2,989 GBP (89%) vs most expensive(unlock to see where)
25 retailers carry this diamond
Most expensive: £3,357 GBP at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 1.7ct lab-grown marquise diamond

This 1.7ct 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 LG818668458 or 818668458. Listed at 25 retailers as of October 28, 2026, with prices from £368 to £3,357, a £2,989 spread on the same certified stone. Brilliant Earth lists it at £3,357. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.70
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle39.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818668458
Dimensions12.57 × 6.12 × 3.83 mm
L/W Ratio2.05
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.57 mm6.12 mm1.70 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818668458
Side View
Table 61.0%Crown 35.1°Girdle: MED-STKPavilion 39.5°Culet: NoneDepth 62.6%

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: £3,357 GBP|Low: £353 GBP|High: £3,462 GBP|Avg: £1,037 GBP|-3.0%
Brilliant Earth
Retailer 2
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Retailer 21
October 30, 2026
Retailer 6£368 GBP
Retailer 7£411 GBP
Retailer 11£412 GBP
Retailer 8£456 GBP
Retailer 12£456 GBP
Retailer 20£472 GBP
Retailer 18£559 GBP
Retailer 16£667 GBP
Retailer 9£692 GBP
Retailer 14£693 GBP
Retailer 2£710 GBP
Retailer 15£758 GBP
Retailer 17£784 GBP
Retailer 21£1,060 GBP
Retailer 13£1,062 GBP
Retailer 10£1,200 GBP
Retailer 3£1,591 GBP
Retailer 5£1,706 GBP
Retailer 19£1,914 GBP
Retailer 4£2,142 GBP
Brilliant Earth£3,357 GBP

38 data points across 21 retailers

25 retailers£368 GBP to £3,357 GBP

A
Cheapest Retailer
-
£368 GBP
$490 USD
A
Retailer 2
-
£411 GBP
$547 USD
View
Final sale: no returns
A
Retailer 3
-
£412 GBP
$549 USD
View
Retailer 4
-
£456 GBP
$607 USD
View
Price last confirmed 14 days ago
A
Retailer 5
-
£456 GBP
$607 USD
View
Retailer 6
-
£472 GBP
View
Price last confirmed 13 days ago
A
Retailer 7
-
£559 GBP
$745 USD
View
A
Retailer 8
-
£667 GBP
€846 EUR
View
A
Retailer 9
-
£692 GBP
A$1,418 AUD
View
A
Retailer 10
-
£693 GBP
$923 USD
View
A
Retailer 11
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£710 GBP
$946 USD
View
A
Retailer 12
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£758 GBP
View
A
Retailer 13
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£784 GBP
ZAR 16,866 ZAR
View
A
Retailer 14
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£992 GBP
$1,321 USD
View
A
Retailer 15
-
£1,011 GBP
$1,346 USD
View
A
Retailer 16
-
£1,060 GBP
$1,412 USD
View
A
Retailer 17
-
£1,062 GBP
A$2,176 AUD
View
A
Retailer 18
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£1,200 GBP
$1,598 USD
View
B+
Retailer 19
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£1,487 GBP
$1,980 USD
View
B+
Retailer 20
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£1,591 GBP
$2,119 USD
View
B+
Retailer 21
-
£1,706 GBP
$2,272 USD
View
B+
Retailer 22
-
£1,914 GBP
View
B+
Retailer 23
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£1,991 GBP
$2,651 USD
View
Retailer 24
-
£2,142 GBP
A$4,389 AUD
View
Price last confirmed 21 days ago
Most Expensive
B
Brilliant Earth
21063499A · Oct 28
£3,357 GBP
$4,470 USD
View
24 more retailers have this diamond
Prices start from £368 GBPSave up to £2,989 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
1.70ct Marquise
£368 GBP