Marquise|Natural|GIA

1.00ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 2556243794

Certificate GIA 2556243794

Diamond specifications and retailer prices

From £1,431 GBP
As of November 6, 2026
Save £1,925 GBP (57%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £4,016 GBP at NZ Jewellers · As of September 30, 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 2556243794. Listed at 19 retailers as of November 4, 2026, with a 135% 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
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 2556243794
Dimensions9.61 × 5.14 × 3.30 mm
L/W Ratio1.87
Top View
9.61 mm5.14 mm1.00 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 2556243794
Side View
Table 63.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 64.3%

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: £4,016 GBP|Low: £1,431 GBP|High: £4,016 GBP|Avg: £2,371 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
November 6, 2026
Retailer 2£1,431 GBP
Retailer 9£1,685 GBP
Retailer 11£1,772 GBP
Retailer 4£1,901 GBP
Retailer 3£2,010 GBP
Retailer 5£2,020 GBP
Retailer 12£2,152 GBP
Retailer 6£2,344 GBP
Retailer 8£2,397 GBP
Retailer 10£2,764 GBP
Retailer 7£3,355 GBP
NZ Jewellers£4,016 GBP

35 data points across 12 retailers

19 retailers£1,431 GBP to £3,355 GBP

A
Cheapest Retailer
-
£1,431 GBP
B+
Retailer 2
-
£1,685 GBP
View
B+
Retailer 3
-
£1,720 GBP
View
B+
Retailer 4
-
£1,753 GBP
View
B+
Retailer 5
-
£1,772 GBP
View
Final sale: no returns
B
Retailer 6
-
£1,901 GBP
View
Retailer 7
-
£1,921 GBP
View
Price last confirmed 45 days ago
Retailer 8
-
£1,921 GBP
View
Price last confirmed 25 days ago
Retailer 9
-
£1,921 GBP
View
Price last confirmed 29 days ago
B
Retailer 10
-
£2,020 GBP
View
Retailer 11
-
£2,152 GBP
View
Price last confirmed 30 days ago
B
Retailer 12
-
£2,208 GBP
View
Retailer 13
-
£2,217 GBP
View
Price last confirmed 45 days ago
Retailer 14
-
£2,217 GBP
View
Price last confirmed 28 days ago
B
Retailer 15
-
£2,344 GBP
View
B
Retailer 16
-
£2,397 GBP
View
Retailer 17
-
£2,764 GBP
View
Price last confirmed 10 days ago
B
Retailer 18
-
£3,355 GBP
View
Most Expensive
NZ Jewellers
24ef520f-79b3-42a4-b61e-99c23dea28c3 · Sep 30
£4,016 GBP
$5,375 USD
View
Price last confirmed 37 days ago
18 more retailers have this diamond
Prices start from £1,431 GBPSave up to £1,925 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
£1,431 GBP