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Marquise|Natural|GIA

0.50ct H SI1 Marquise Natural Diamond

VG • H/SI1 • GIA 6551995451

Certificate GIA 6551995451

Diamond specifications and retailer prices

From £373 GBP
As of November 6, 2026
Save £1,027 GBP (73%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,399 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 0.5ct natural marquise diamond

This 0.5ct natural marquise sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6551995451. Listed at 19 retailers as of November 5, 2026, with prices from £373 to £1,399, a £1,027 spread on the same certified stone. NZ Jewellers lists it at £1,399. 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

0.50
Carat
H
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishVery Good
SymmetryGood
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 6551995451
Dimensions7.36 × 4.39 × 2.48 mm
L/W Ratio1.68
Key to symbols
Twinning Wisp, Crystal, Feather
Top View
7.36 mm4.39 mm0.50 ctH / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryGood
FluorescenceStrong
CertificateGIA 6551995451
Side View
Table 61.0%CrownGirdle: VTK-ETKPavilionCulet: NoneDepth 56.6%

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: Nov 6
Current: £1,399 GBP|Low: £373 GBP|High: £1,456 GBP|Avg: £610 GBP|-3.9%
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
Retailer 15
Retailer 16
Retailer 17
Retailer 18
November 6, 2026
Retailer 4£373 GBP
Retailer 5£412 GBP
Retailer 13£446 GBP
Retailer 8£456 GBP
Retailer 9£464 GBP
Retailer 3£480 GBP
Retailer 15£480 GBP
Retailer 10£515 GBP
Retailer 18£515 GBP
Retailer 12£542 GBP
Retailer 6£544 GBP
Retailer 2£545 GBP
Retailer 17£559 GBP
Retailer 7£590 GBP
Retailer 11£656 GBP
Retailer 14£689 GBP
Retailer 16£1,035 GBP
NZ Jewellers£1,399 GBP

26 data points across 18 retailers

19 retailers£373 GBP to £1,399 GBP

A
Cheapest Retailer
-
£373 GBP
B+
Retailer 2
-
£412 GBP
View
Final sale: no returns
B+
Retailer 3
-
£446 GBP
View
B+
Retailer 4
-
£456 GBP
View
Retailer 5
-
£464 GBP
View
Price last confirmed 10 days ago
B+
Retailer 6
-
£480 GBP
View
Retailer 7
-
£480 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£515 GBP
View
Retailer 9
-
£515 GBP
View
Price last confirmed 19 days ago
B+
Retailer 10
-
£542 GBP
View
B+
Retailer 11
-
£544 GBP
View
B+
Retailer 12
-
£545 GBP
View
B
Retailer 13
-
£559 GBP
View
B
Retailer 14
-
£590 GBP
View
B
Retailer 15
-
£656 GBP
View
B
Retailer 16
-
£689 GBP
View
Retailer 17
-
£698 GBP
View
Price last confirmed 33 days ago
Retailer 18
-
£1,035 GBP
View
Price last confirmed 8 days ago
Most Expensive
C
NZ Jewellers
a37c93f1-97a8-4566-98a8-e8a598bbe4cb · Nov 5
£1,399 GBP
$1,873 USD
View
18 more retailers have this diamond
Prices start from £373 GBPSave up to £1,027 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
0.50ct Marquise
£373 GBP