CaratHunter
Plans
Round|Natural|GIA

1.00ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 2506134651

Shape and cutting style on the report: Round brilliant

Certificate GIA 2506134651

Diamond specifications and retailer prices

From £1,363 GBP
As of November 6, 2026
Save £2,586 GBP (65%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £3,949 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2506134651. Listed at 21 retailers as of November 5, 2026, with prices from £1,363 to £3,949, a £2,586 spread on the same certified stone. NZ Jewellers lists it at £3,949. 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

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2506134651
Dimensions6.39 × 6.35 × 3.99 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
6.39 mm6.35 mm1.00 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2506134651
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.7%

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: £1,363 GBP|Low: £1,363 GBP|High: £3,349 GBP|Avg: £2,019 GBP|-3.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 1£1,363 GBP
Retailer 7£1,388 GBP
Retailer 8£1,707 GBP
Retailer 9£1,743 GBP
Retailer 2£1,782 GBP
Retailer 3£1,987 GBP
Retailer 6£2,135 GBP
Retailer 4£2,305 GBP
Retailer 5£3,300 GBP

29 data points across 9 retailers

21 retailers£1,363 GBP to £3,949 GBP

A
Cheapest Retailer
-
£1,363 GBP
B+
Retailer 2
-
£1,388 GBP
View
B+
Retailer 3
-
£1,653 GBP
View
B+
Retailer 4
-
£1,656 GBP
View
B+
Retailer 5
-
£1,707 GBP
View
Retailer 6
-
£1,722 GBP
View
Price last confirmed 82 days ago
B
Retailer 7
-
£1,743 GBP
View
Final sale: no returns
B+
Retailer 8
-
£1,782 GBP
View
B+
Retailer 9
-
£1,872 GBP
View
B+
Retailer 10
-
£1,889 GBP
View
B
Retailer 11
-
£1,924 GBP
View
B
Retailer 12
-
£1,976 GBP
View
B+
Retailer 13
-
£1,987 GBP
View
B
Retailer 14
-
£1,993 GBP
View
Retailer 15
-
£2,116 GBP
View
Price last confirmed 30 days ago
B
Retailer 16
-
£2,135 GBP
View
B
Retailer 17
-
£2,179 GBP
View
B
Retailer 18
-
£2,305 GBP
View
B
Retailer 19
-
£2,588 GBP
View
B
Retailer 20
-
£3,300 GBP
View
Most Expensive
B
NZ Jewellers
8b7bb6df-972d-41c2-b5d1-2a135753b617 · Nov 5
£3,949 GBP
$5,315 USD
View
20 more retailers have this diamond
Prices start from £1,363 GBPSave up to £2,586 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 Round
£1,363 GBP