Round|Natural|GIA

1.00ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 1559567941

Certificate GIA 1559567941

Diamond specifications and retailer prices

From £1,438 GBP
As of November 6, 2026
22 retailers carry this diamond
Most expensive: £2,950 GBP at NZ Jewellers · As of October 11, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1559567941. Listed at 22 retailers as of November 6, 2026. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1559567941
Dimensions6.34 × 6.38 × 3.94 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.34 mm6.38 mm1.00 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1559567941
Side View
Table 58.0%Crown 36°Girdle: THN-STKPavilion 40.6°Culet: NDepth 61.9%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 6
Current: £2,950 GBP|Low: £1,181 GBP|High: £2,950 GBP|Avg: £1,537 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
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
October 26, 2026
Retailer 15£1,181 GBP
Retailer 13£1,181 GBP
Retailer 10£1,197 GBP
Retailer 6£1,210 GBP
Retailer 8£1,210 GBP
Retailer 16£1,241 GBP
Retailer 7£1,265 GBP
Retailer 12£1,270 GBP
Retailer 5£1,285 GBP
Retailer 9£1,395 GBP
Retailer 17£1,422 GBP
Retailer 2£1,482 GBP
Retailer 14£1,533 GBP
Retailer 4£1,565 GBP
Retailer 11£1,659 GBP
Retailer 18£1,927 GBP
Retailer 3£2,117 GBP
NZ Jewellers£2,950 GBP

32 data points across 18 retailers

22 retailers

Retailer 1
-
£1,181 GBP
Price last confirmed 13 days ago
Retailer 2
-
£1,181 GBP
View
Price last confirmed 13 days ago
Retailer 3
-
£1,197 GBP
View
Price last confirmed 11 days ago
Retailer 4
-
£1,210 GBP
View
Price last confirmed 27 days ago
Retailer 5
-
£1,210 GBP
View
Price last confirmed 25 days ago
Retailer 6
-
£1,210 GBP
View
Price last confirmed 12 days ago
Retailer 7
-
£1,210 GBP
View
Price last confirmed 15 days ago
Retailer 8
-
£1,210 GBP
View
Price last confirmed 25 days ago
Retailer 9
-
£1,241 GBP
View
Price last confirmed 10 days ago
Retailer 10
-
£1,265 GBP
View
Price last confirmed 15 days ago
Retailer 11
-
£1,270 GBP
View
Price last confirmed 11 days ago
Retailer 12
-
£1,285 GBP
View
Price last confirmed 10 days ago
Retailer 13
-
£1,395 GBP
View
Price last confirmed 26 days ago
Retailer 14
-
£1,395 GBP
View
Price last confirmed 14 days ago
Retailer 15
-
£1,422 GBP
View
Price last confirmed 13 days ago
B+
Retailer 16
-
£1,438 GBP
View
Retailer 17
-
£1,533 GBP
View
Price last confirmed 9 days ago
Retailer 18
-
£1,659 GBP
View
Price last confirmed 11 days ago
Retailer 19
-
£1,927 GBP
View
Price last confirmed 11 days ago
Retailer 20
-
£2,117 GBP
View
Price last confirmed 12 days ago
Retailer 21
-
£2,950 GBP
View
Price last confirmed 14 days ago
Most Expensive
NZ Jewellers
ac85094a-1a38-4c69-a7f7-313bfe985f19 · Oct 11
£2,950 GBP
$3,971 USD
View
Price last confirmed 26 days ago
21 more retailers have this diamond
Prices start from £1,438 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 Round
£1,438 GBP