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Marquise|Natural|IGI

0.51ct G SI2 Marquise Natural Diamond

VG • G/SI2 • IGI 823661666

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 823661666

Diamond specifications and retailer prices

From £503 GBP
As of October 28, 2026
Save £810 GBP (62%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £1,313 GBP at NZ Jewellers · As of October 27, 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 G colour (near-colourless) and SI2 clarity (slightly-included), with a very-good cut grade and certified by IGI 823661666. Listed at 8 retailers as of October 27, 2026, with prices from £503 to £1,313, a £810 spread on the same certified stone. NZ Jewellers lists it at £1,313. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
G
Colour
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle34.2°
Pavilion angle39.4°
OriginNatural
Grading LabIGI
CertificateIGI 823661666
Dimensions7.88 × 4.18 × 2.58 mm
L/W Ratio1.89
Girdle conditionFaceted
Culet sizeNone
Top View
7.88 mm4.18 mm0.51 ctG / SI2
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI 823661666
Side View
Table 62.0%Crown 34.2°Girdle: STK-VTKPavilion 39.4°Culet: NoneDepth 61.7%

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 28
Current: £1,313 GBP|Low: £419 GBP|High: £1,313 GBP|Avg: £656 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 28, 2026
Retailer 6£419 GBP
Retailer 5£451 GBP
Retailer 3£503 GBP
Retailer 8£510 GBP
Retailer 2£587 GBP
Retailer 7£620 GBP
Retailer 4£969 GBP
NZ Jewellers£1,313 GBP

20 data points across 8 retailers

8 retailers£503 GBP to £1,313 GBP

Retailer 1
-
£419 GBP
$561 USD
Price last confirmed 7 days ago
Retailer 2
-
£451 GBP
$604 USD
View
Price last confirmed 7 days ago
A
Retailer 3
-
£503 GBP
View
B+
Retailer 4
-
£510 GBP
$684 USD
View
B+
Retailer 5
-
£587 GBP
€749 EUR
View
B+
Retailer 6
-
£620 GBP
$831 USD
View
B
Retailer 7
-
£969 GBP
View
Most Expensive
C
NZ Jewellers
68d5679f-f56e-440c-93f2-a3585682d507 · Oct 27
£1,313 GBP
$1,759 USD
View
7 more retailers have this diamond
Prices start from £503 GBPSave up to £810 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
£503 GBP