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Marquise|Natural|GIA

1.00ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 6555512678

Certificate GIA 6555512678

Diamond specifications and retailer prices

From £1,554 GBP
As of November 6, 2026
Save £2,256 GBP (59%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £3,810 GBP at NZ Jewellers · As of November 5, 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 6555512678. Listed at 18 retailers as of November 5, 2026, with prices from £1,554 to £3,810, a £2,256 spread on the same certified stone. NZ Jewellers lists it at £3,810. 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
SymmetryExcellent
FluorescenceNone
Crown angle37°
OriginNatural
Grading LabGIA
CertificateGIA 6555512678
Dimensions9.77 × 5.25 × 3.39 mm
L/W Ratio1.86
Culet sizeNone
Key to symbols
Feather, Crystal, Pinpoint, Knot
Top View
9.77 mm5.25 mm1.00 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555512678
Side View
Table 61.0%Crown 37°Girdle: STK-VTKPavilionCulet: NDepth 64.6%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: £3,810 GBP|Low: £1,554 GBP|High: £3,879 GBP|Avg: £2,100 GBP|-1.8%
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
November 6, 2026
Retailer 9£1,554 GBP
Retailer 4£1,647 GBP
Retailer 5£1,682 GBP
Retailer 2£1,768 GBP
Retailer 14£1,812 GBP
Retailer 7£1,823 GBP
Retailer 17£1,823 GBP
Retailer 6£1,907 GBP
Retailer 3£1,927 GBP
Retailer 11£1,928 GBP
Retailer 16£1,977 GBP
Retailer 8£1,980 GBP
Retailer 15£2,103 GBP
Retailer 10£2,224 GBP
Retailer 13£2,266 GBP
Retailer 12£3,184 GBP
NZ Jewellers£3,810 GBP

27 data points across 17 retailers

18 retailers£1,554 GBP to £3,810 GBP

B+
Cheapest Retailer
-
£1,554 GBP
B+
Retailer 2
-
£1,647 GBP
View
B+
Retailer 3
-
£1,682 GBP
View
Final sale: no returns
B+
Retailer 4
-
£1,768 GBP
View
B+
Retailer 5
-
£1,812 GBP
View
B+
Retailer 6
-
£1,823 GBP
View
Retailer 7
-
£1,823 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£1,907 GBP
View
B+
Retailer 9
-
£1,927 GBP
View
B+
Retailer 10
-
£1,928 GBP
View
B
Retailer 11
-
£1,977 GBP
View
B
Retailer 12
-
£1,980 GBP
View
B+
Retailer 13
-
£2,103 GBP
View
B
Retailer 14
-
£2,224 GBP
View
B
Retailer 15
-
£2,266 GBP
View
Retailer 16
-
£2,372 GBP
View
Price last confirmed 30 days ago
B
Retailer 17
-
£3,184 GBP
View
Most Expensive
B
NZ Jewellers
71be0534-a66f-4f59-9929-7973de153c9d · Nov 5
£3,810 GBP
$5,100 USD
View
17 more retailers have this diamond
Prices start from £1,554 GBPSave up to £2,256 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+
1.00ct Marquise
£1,554 GBP