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Marquise|Natural|IGI

0.51ct I SI2 Marquise Natural Diamond

GD • I/SI2 • IGI 649481398

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 649481398

Diamond specifications and retailer prices

From £301 GBP
As of November 5, 2026
Save £853 GBP (74%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,154 GBP at NZ Jewellers · As of November 5, 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 SI2 clarity (slightly-included), with a standard cut grade and certified by IGI 649481398. Listed at 13 retailers as of November 5, 2026, with prices from £301 to £1,154, a £853 spread on the same certified stone. NZ Jewellers lists it at £1,154. 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
I
Colour
SI2
Clarity
Good
Cut

Specifications

CutGood
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38.2°
Pavilion angle36.7°
OriginNatural
Grading LabIGI
CertificateIGI 649481398
Dimensions9.00 × 4.02 × 2.32 mm
L/W Ratio2.24
Girdle conditionFaceted
Culet sizePointed
Top View
9.00 mm4.02 mm0.51 ctI / SI2
OriginNatural
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI 649481398
Side View
Table 64.0%Crown 38.2°Girdle: STK-VTKPavilion 36.7°Culet: NoneDepth 57.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £1,154 GBP|Low: £301 GBP|High: £1,154 GBP|Avg: £459 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
Retailer 14
November 6, 2026
Retailer 3£301 GBP
Retailer 9£314 GBP
Retailer 4£324 GBP
Retailer 10£324 GBP
Retailer 12£329 GBP
Retailer 14£347 GBP
Retailer 2£357 GBP
Retailer 5£398 GBP
Retailer 11£418 GBP
Retailer 13£421 GBP
Retailer 6£452 GBP
Retailer 7£542 GBP
Retailer 8£694 GBP
NZ Jewellers£1,154 GBP

42 data points across 14 retailers

13 retailers£301 GBP to £1,154 GBP

Retailer 1
-
£301 GBP
Price last confirmed 53 days ago
B+
Retailer 2
-
£301 GBP
View
B+
Retailer 3
-
£314 GBP
View
Retailer 4
-
£324 GBP
View
Price last confirmed 8 days ago
B+
Retailer 5
-
£324 GBP
View
B+
Retailer 6
-
£347 GBP
View
B+
Retailer 7
-
£357 GBP
View
B+
Retailer 8
-
£398 GBP
View
B+
Retailer 9
-
£418 GBP
View
B+
Retailer 10
-
£421 GBP
View
B
Retailer 11
-
£542 GBP
View
B
Retailer 12
-
£694 GBP
View
Most Expensive
C
NZ Jewellers
dc731d7a-b765-4572-94a9-9777cff5c7f0 · Nov 5
£1,154 GBP
$1,545 USD
View
12 more retailers have this diamond
Prices start from £301 GBPSave up to £853 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.

B+
0.51ct Marquise
£301 GBP