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Marquise|Lab Grown|IGI

0.51ct D FL Marquise Lab Grown Diamond

EX • D/FL • IGI LG831629028

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG831629028

Diamond specifications and retailer prices

From £225 GBP
As of November 4, 2026
Save £935 GBP (81%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £1,161 GBP at Riddles Jewelry · As of November 4, 2026
View at Riddles Jewelry

About this 0.51ct lab-grown marquise diamond

This 0.51ct lab-grown marquise sits in the half to three-quarter carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG831629028 or 831629028. Listed at 21 retailers as of November 4, 2026, with prices from £225 to £1,161, a £935 spread on the same certified stone. Riddles Jewelry lists it at £1,161. Flawless clarity in sub-one-carat stones is rarely visible to the naked eye over VS1, so you are paying a meaningful premium for grade rather than appearance.

The 4Cs

0.51
Carat
D
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831629028
Dimensions8.39 × 4.15 × 2.56 mm
L/W Ratio2.02
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.39 mm4.15 mm0.51 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG831629028
Side View
Table 58.0%Crown 34°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 61.7%

Caratlytics Score

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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: Nov 4
Current: £490 GBP|Low: £216 GBP|High: £1,131 GBP|Avg: £522 GBP|+2.2%
Retailer 1
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Retailer 5
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Retailer 7
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Retailer 9
Retailer 10
Retailer 11
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Retailer 15
November 5, 2026
Retailer 13£225 GBP
Retailer 2£261 GBP
Retailer 5£276 GBP
Retailer 3£279 GBP
Retailer 14£279 GBP
Retailer 4£403 GBP
Retailer 10£435 GBP
Retailer 12£444 GBP
Retailer 11£470 GBP
Retailer 1£490 GBP
Retailer 9£506 GBP
Retailer 6£595 GBP
Retailer 15£897 GBP
Retailer 8£1,115 GBP
Retailer 7£1,130 GBP

45 data points across 15 retailers

21 retailers£225 GBP to £1,161 GBP

A
Cheapest Retailer
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£225 GBP
A
Retailer 2
-
£261 GBP
View
Retailer 3
-
£276 GBP
View
Price last confirmed 41 days ago
A
Retailer 4
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£276 GBP
View
Final sale: no returns
Retailer 5
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£279 GBP
View
Price last confirmed 11 days ago
A
Retailer 6
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£279 GBP
View
A
Retailer 7
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£294 GBP
View
B+
Retailer 8
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£403 GBP
View
Retailer 9
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£435 GBP
View
Price last confirmed 9 days ago
B+
Retailer 10
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£444 GBP
View
B+
Retailer 11
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£470 GBP
View
B+
Retailer 12
-
£490 GBP
View
B+
Retailer 13
-
£506 GBP
View
B
Retailer 14
-
£595 GBP
View
B
Retailer 15
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£897 GBP
View
B
Retailer 16
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£932 GBP
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B
Retailer 17
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£983 GBP
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B
Retailer 18
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£999 GBP
View
B
Retailer 19
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£1,115 GBP
View
B
Retailer 20
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£1,130 GBP
View
Most Expensive
B
Riddles Jewelry
1978578181 · Nov 4
£1,161 GBP
$1,562 USD
View
20 more retailers have this diamond
Prices start from £225 GBPSave up to £935 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
0.51ct Marquise
£225 GBP