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Marquise|Natural|GIA

1.03ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 1558431023

Certificate GIA 1558431023

Diamond specifications and retailer prices

From £1,727 GBP
As of October 31, 2026
Save £2,274 GBP (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £4,001 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.03ct natural marquise diamond

This 1.03ct natural marquise sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1558431023. Listed at 20 retailers as of October 31, 2026, with prices from £1,727 to £4,001, a £2,274 spread on the same certified stone. NZ Jewellers lists it at £4,001. 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

1.03
Carat
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1558431023
Dimensions10.04 × 5.28 × 3.37 mm
L/W Ratio1.90
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather
Top View
10.04 mm5.28 mm1.03 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558431023
Side View
Table 60.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 63.9%

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: £4,001 GBP|Low: £1,722 GBP|High: £4,146 GBP|Avg: £2,510 GBP|-3.5%
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
November 6, 2026
Retailer 12£1,727 GBP
Retailer 7£2,056 GBP
Retailer 4£2,058 GBP
Retailer 15£2,058 GBP
Retailer 5£2,073 GBP
Retailer 2£2,227 GBP
Retailer 14£2,297 GBP
Retailer 8£2,373 GBP
Retailer 3£2,385 GBP
Retailer 6£2,403 GBP
Retailer 13£2,649 GBP
Retailer 10£2,687 GBP
Retailer 9£2,802 GBP
Retailer 11£3,839 GBP
NZ Jewellers£4,001 GBP

25 data points across 15 retailers

20 retailers£1,727 GBP to £4,001 GBP

A
Cheapest Retailer
-
£1,727 GBP
B+
Retailer 2
-
£2,056 GBP
View
A
Retailer 3
-
£2,058 GBP
View
A
Retailer 4
-
£2,058 GBP
View
B+
Retailer 5
-
£2,073 GBP
View
B+
Retailer 6
-
£2,227 GBP
View
Retailer 7
-
£2,297 GBP
View
Price last confirmed 42 days ago
Retailer 8
-
£2,297 GBP
View
Price last confirmed 9 days ago
B+
Retailer 9
-
£2,297 GBP
View
B+
Retailer 10
-
£2,373 GBP
View
B+
Retailer 11
-
£2,385 GBP
View
B+
Retailer 12
-
£2,403 GBP
View
Retailer 13
-
£2,453 GBP
View
Price last confirmed 31 days ago
Retailer 14
-
£2,649 GBP
View
Price last confirmed 44 days ago
B+
Retailer 15
-
£2,649 GBP
View
B
Retailer 16
-
£2,687 GBP
View
B+
Retailer 17
-
£2,802 GBP
View
B
Retailer 18
-
£3,839 GBP
View
Retailer 19
-
£4,001 GBP
View
Price last confirmed 43 days ago
Most Expensive
B
NZ Jewellers
4373f7b7-d4b0-48b8-a48e-58b472d3a21f · Nov 5
£4,001 GBP
$5,355 USD
View
19 more retailers have this diamond
Prices start from £1,727 GBPSave up to £2,274 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
1.03ct Marquise
£1,727 GBP