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Marquise|Lab Grown|IGI

1.70ct E FL Marquise Lab Grown Diamond

EX • E/FL • IGI LG817693361

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG817693361

Diamond specifications and retailer prices

From £673 GBP
$902 USD
As of October 30, 2026
Save £2,237 GBP (77%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £2,911 GBP at Brilliant Earth · As of October 30, 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 FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG817693361 or 817693361. Listed at 21 retailers as of October 30, 2026, with prices from £673 to £2,911, a £2,237 spread on the same certified stone. Brilliant Earth lists it at £2,911. 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
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817693361
Dimensions11.99 × 6.28 × 3.93 mm
L/W Ratio1.91
Girdle conditionFaceted
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
11.99 mm6.28 mm1.70 ctE / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG817693361
Side View
Table 57.0%Crown 35.6°Girdle: MED-STKPavilion 40.3°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: £2,911 GBP|Low: £673 GBP|High: £3,814 GBP|Avg: £1,852 GBP|-23.7%
Brilliant Earth
Retailer 2
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Retailer 20
October 30, 2026
Retailer 4£673 GBP
Retailer 19£732 GBP
Retailer 6£753 GBP
Retailer 16£781 GBP
Retailer 5£908 GBP
Retailer 15£911 GBP
Retailer 20£1,091 GBP
Retailer 2£1,202 GBP
Retailer 13£1,245 GBP
Retailer 7£1,252 GBP
Retailer 14£1,435 GBP
Retailer 10£1,737 GBP
Retailer 3£2,161 GBP
Retailer 17£2,195 GBP
Retailer 8£2,317 GBP
Retailer 9£2,562 GBP
Retailer 11£2,622 GBP
Retailer 18£2,651 GBP
Retailer 12£2,712 GBP
Brilliant Earth£2,911 GBP

35 data points across 20 retailers

21 retailers£673 GBP to £2,911 GBP

A
Cheapest Retailer
-
£673 GBP
$902 USD
A
Retailer 2
-
£732 GBP
$981 USD
View
A
Retailer 3
-
£753 GBP
$1,009 USD
View
Final sale: no returns
A
Retailer 4
-
£781 GBP
$1,046 USD
View
A
Retailer 5
-
£908 GBP
HK$9,500 HKD
View
A
Retailer 6
-
£911 GBP
$1,220 USD
View
Retailer 7
-
£977 GBP
$1,309 USD
View
Price last confirmed 14 days ago
A
Retailer 8
-
£1,091 GBP
$1,462 USD
View
A
Retailer 9
-
£1,202 GBP
View
A
Retailer 10
-
£1,245 GBP
€1,589 EUR
View
A
Retailer 11
-
£1,252 GBP
$1,677 USD
View
B+
Retailer 12
-
£1,435 GBP
ZAR 31,066 ZAR
View
B+
Retailer 13
-
£1,737 GBP
$2,327 USD
View
B+
Retailer 14
-
£2,161 GBP
View
B
Retailer 15
-
£2,195 GBP
$2,941 USD
View
B+
Retailer 16
-
£2,317 GBP
$3,104 USD
View
B
Retailer 17
-
£2,562 GBP
$3,433 USD
View
B
Retailer 18
-
£2,622 GBP
SGD 4,747 SGD
View
B
Retailer 19
-
£2,651 GBP
View
B
Retailer 20
-
£2,712 GBP
$3,634 USD
View
Most Expensive
B
Brilliant Earth
20860257A · Oct 30
£2,911 GBP
$3,900 USD
View
20 more retailers have this diamond
Prices start from £673 GBPSave up to £2,237 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
£673 GBP