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Marquise|Natural|IGI

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • IGI 839658603

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 839658603

Diamond specifications and retailer prices

From £271 GBP
₹34,669 INR
As of October 31, 2026
Save £1,094 GBP (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,365 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 839658603. Listed at 12 retailers as of October 30, 2026, with prices from £271 to £1,365, a £1,094 spread on the same certified stone. NZ Jewellers lists it at £1,365. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

0.51
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.3°
Pavilion angle39.5°
OriginNatural
Grading LabIGI
CertificateIGI 839658603
Dimensions8.28 × 4.16 × 2.59 mm
L/W Ratio1.99
Girdle conditionFaceted
Top View
8.28 mm4.16 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 839658603
Side View
Table 60.0%Crown 37.3°Girdle: MED-STKPavilion 39.5°Culet: NoneDepth 62.3%

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 31
Current: £1,365 GBP|Low: £271 GBP|High: £1,365 GBP|Avg: £500 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 31, 2026
Retailer 2£271 GBP
Retailer 3£328 GBP
Retailer 5£339 GBP
Retailer 13£356 GBP
Retailer 11£384 GBP
Retailer 4£411 GBP
Retailer 8£439 GBP
Retailer 12£463 GBP
Retailer 6£466 GBP
Retailer 7£496 GBP
Retailer 10£506 GBP
Retailer 9£823 GBP
NZ Jewellers£1,365 GBP

14 data points across 13 retailers

12 retailers£271 GBP to £1,365 GBP

A
Cheapest Retailer
-
£271 GBP
₹34,669 INR
Retailer 2
-
£339 GBP
$455 USD
View
Price last confirmed 15 days ago
A
Retailer 3
-
£356 GBP
$478 USD
View
A
Retailer 4
-
£384 GBP
$515 USD
View
A
Retailer 5
-
£411 GBP
$552 USD
View
A
Retailer 6
-
£439 GBP
View
B+
Retailer 7
-
£463 GBP
$621 USD
View
B+
Retailer 8
-
£466 GBP
View
B+
Retailer 9
-
£496 GBP
€634 EUR
View
B+
Retailer 10
-
£506 GBP
$680 USD
View
Retailer 11
-
£823 GBP
View
Price last confirmed 7 days ago
Most Expensive
B
NZ Jewellers
8931b356-73f5-4507-8694-f0697f6376fd · Oct 30
£1,365 GBP
$1,832 USD
View
11 more retailers have this diamond
Prices start from £271 GBPSave up to £1,094 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
£271 GBP