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Marquise|Natural|GIA

1.00ct J SI1 Marquise Natural Diamond

ID • J/SI1 • GIA 2556947990

Certificate GIA 2556947990

Diamond specifications and retailer prices

From £1,523 GBP
As of November 6, 2026
Save £1,870 GBP (55%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,186 GBP at NZ Jewellers · As of October 6, 2026
View at NZ Jewellers

About this 1ct natural marquise diamond

This 1ct natural marquise sits in the classic one-carat band, graded J 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 2556947990. Listed at 21 retailers as of November 2, 2026, with a 123% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.00
Carat
J
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2556947990
Dimensions9.73 × 5.17 × 3.30 mm
L/W Ratio1.88
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Cloud, Twinning Wisp, Crystal, Needle
Top View
9.73 mm5.17 mm1.00 ctJ / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556947990
Side View
Table 60.0%CrownGirdle: MED-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: Nov 6
Current: £3,011 GBP|Low: £1,523 GBP|High: £3,545 GBP|Avg: £2,110 GBP|-2.2%
Retailer 1
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 4£1,523 GBP
Retailer 5£1,559 GBP
Retailer 14£1,619 GBP
Retailer 3£1,752 GBP
Retailer 12£1,783 GBP
Retailer 6£1,789 GBP
Retailer 13£1,791 GBP
Retailer 7£1,879 GBP
Retailer 9£2,037 GBP
Retailer 2£2,225 GBP
Retailer 8£2,284 GBP
Retailer 10£2,364 GBP
Retailer 1£3,011 GBP
Retailer 11£3,393 GBP

27 data points across 14 retailers

21 retailers£1,523 GBP to £3,393 GBP

A
Cheapest Retailer
-
£1,523 GBP
Retailer 2
-
£1,559 GBP
View
Price last confirmed 16 days ago
B+
Retailer 3
-
£1,619 GBP
View
Final sale: no returns
B+
Retailer 4
-
£1,752 GBP
View
B+
Retailer 5
-
£1,783 GBP
View
B+
Retailer 6
-
£1,789 GBP
View
B+
Retailer 7
-
£1,791 GBP
View
B+
Retailer 8
-
£1,879 GBP
View
Retailer 9
-
£2,002 GBP
View
Price last confirmed 30 days ago
Retailer 10
-
£2,002 GBP
View
Price last confirmed 29 days ago
B+
Retailer 11
-
£2,037 GBP
View
Retailer 12
-
£2,114 GBP
View
Price last confirmed 36 days ago
B
Retailer 13
-
£2,225 GBP
View
Retailer 14
-
£2,243 GBP
View
Price last confirmed 30 days ago
B+
Retailer 15
-
£2,284 GBP
View
Retailer 16
-
£2,310 GBP
View
Price last confirmed 28 days ago
Retailer 17
-
£2,348 GBP
View
Price last confirmed 61 days ago
B
Retailer 18
-
£2,364 GBP
View
B
Retailer 19
-
£3,011 GBP
View
B
Retailer 20
-
£3,393 GBP
View
Most Expensive
NZ Jewellers
d63d4123-be0c-4f0a-ac4c-091201eb873a · Oct 6
£4,186 GBP
$5,603 USD
View
Price last confirmed 31 days ago
20 more retailers have this diamond
Prices start from £1,523 GBPSave up to £1,870 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
1.00ct Marquise
£1,523 GBP