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Marquise|Lab Grown|IGI

3.51ct E FL Marquise Lab Grown Diamond

ID • E/FL • IGI LG717586084

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG717586084

Diamond specifications and retailer prices

From £5,227 GBP
$7,004 USD
As of October 30, 2026
Save £15,456 GBP (75%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: £20,684 GBP at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

About this 3.51ct lab-grown marquise diamond

This 3.51ct lab-grown marquise sits in the three to five carat band, graded E colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG717586084 or 717586084. Listed at 24 retailers as of October 30, 2026, with prices from £5,227 to £20,684, a £15,456 spread on the same certified stone. Taylor and Hart lists it at £20,684. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

3.51
Carat
E
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG717586084
Dimensions15.17 × 7.77 × 5.08 mm
L/W Ratio1.95
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
15.17 mm7.77 mm3.51 ctE / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG717586084
Side View
Table 56.0%Crown 36.4°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 65.4%

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: £9,292 GBP|Low: £5,227 GBP|High: £21,945 GBP|Avg: £8,524 GBP|-7.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
Taylor and Hart
October 30, 2026
Retailer 7£5,227 GBP
Retailer 5£5,429 GBP
Retailer 2£5,436 GBP
Retailer 11£5,597 GBP
Retailer 19£5,698 GBP
Retailer 4£6,034 GBP
Retailer 6£6,064 GBP
Retailer 9£6,064 GBP
Retailer 20£6,558 GBP
Retailer 8£7,198 GBP
Retailer 18£7,348 GBP
Retailer 13£7,383 GBP
Retailer 14£7,607 GBP
Retailer 10£8,678 GBP
Retailer 17£8,977 GBP
Retailer 1£9,292 GBP
Retailer 16£9,796 GBP
Retailer 3£11,070 GBP
Retailer 15£11,970 GBP
Retailer 12£14,080 GBP
Taylor and Hart£20,684 GBP

33 data points across 21 retailers

24 retailers£5,227 GBP to £20,684 GBP

A
Cheapest Retailer
-
£5,227 GBP
$7,004 USD
B+
Retailer 2
-
£5,429 GBP
$7,274 USD
View
A
Retailer 3
-
£5,436 GBP
$7,284 USD
View
A
Retailer 4
-
£5,597 GBP
$7,499 USD
View
A
Retailer 5
-
£5,698 GBP
$7,635 USD
View
B+
Retailer 6
-
£6,034 GBP
$8,085 USD
View
B+
Retailer 7
-
£6,064 GBP
$8,125 USD
View
Retailer 8
-
£6,064 GBP
$8,125 USD
View
Price last confirmed 15 days ago
B+
Retailer 9
-
£6,558 GBP
$8,787 USD
View
B+
Retailer 10
-
£7,198 GBP
$9,645 USD
View
B+
Retailer 11
-
£7,348 GBP
$9,846 USD
View
Final sale: no returns
Retailer 12
-
£7,383 GBP
View
Price last confirmed 31 days ago
B+
Retailer 13
-
£7,607 GBP
View
Retailer 14
-
£8,295 GBP
$11,115 USD
View
Price last confirmed 33 days ago
B+
Retailer 15
-
£8,678 GBP
View
Retailer 16
-
£8,896 GBP
$11,920 USD
View
Price last confirmed 10 days ago
B
Retailer 17
-
£8,977 GBP
$12,028 USD
View
B+
Retailer 18
-
£9,292 GBP
$12,450 USD
View
B+
Retailer 19
-
£9,796 GBP
€12,501 EUR
View
B+
Retailer 20
-
£10,271 GBP
$13,762 USD
View
B+
Retailer 21
-
£11,070 GBP
$14,832 USD
View
B
Retailer 22
-
£11,970 GBP
View
B
Retailer 23
-
£14,080 GBP
ZAR 304,774 ZAR
View
Most Expensive
B
Taylor and Hart
HWQ20GM · Oct 31
£20,684 GBP
$27,714 USD
View
23 more retailers have this diamond
Prices start from £5,227 GBPSave up to £15,456 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
3.51ct Marquise
£5,227 GBP