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Round|Natural|GIA

1.00ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 6305896366

Certificate GIA 6305896366

Diamond specifications and retailer prices

From £951 GBP
As of November 6, 2026
Save £2,165 GBP (69%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £3,116 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6305896366. Listed at 17 retailers as of November 5, 2026, with prices from £951 to £3,116, a £2,165 spread on the same certified stone. NZ Jewellers lists it at £3,116. 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
SymmetryVery Good
FluorescenceNone
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6305896366
Dimensions6.40 × 6.34 × 3.94 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
6.40 mm6.34 mm1.00 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6305896366
Side View
Table 59.0%Crown 36°Girdle: ThickPavilion 40.6°Culet: NoneDepth 61.8%

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: £1,222 GBP|Low: £941 GBP|High: £2,265 GBP|Avg: £1,363 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 9£951 GBP
Retailer 8£1,120 GBP
Retailer 2£1,164 GBP
Retailer 11£1,179 GBP
Retailer 10£1,196 GBP
Retailer 1£1,222 GBP
Retailer 4£1,327 GBP
Retailer 3£1,337 GBP
Retailer 6£1,409 GBP
Retailer 5£1,612 GBP
Retailer 7£2,232 GBP

41 data points across 11 retailers

17 retailers£951 GBP to £3,116 GBP

A
Cheapest Retailer
-
£951 GBP
A
Retailer 2
-
£1,120 GBP
View
A
Retailer 3
-
£1,164 GBP
View
A
Retailer 4
-
£1,179 GBP
View
Final sale: no returns
A
Retailer 5
-
£1,196 GBP
View
A
Retailer 6
-
£1,222 GBP
View
Retailer 7
-
£1,278 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£1,278 GBP
View
B+
Retailer 9
-
£1,327 GBP
View
B+
Retailer 10
-
£1,337 GBP
View
B+
Retailer 11
-
£1,348 GBP
View
B+
Retailer 12
-
£1,379 GBP
View
B+
Retailer 13
-
£1,409 GBP
View
B+
Retailer 14
-
£1,474 GBP
View
B+
Retailer 15
-
£1,612 GBP
View
B
Retailer 16
-
£2,232 GBP
View
Most Expensive
C
NZ Jewellers
184be088-16c0-4203-b2fc-8cb6bf618a2b · Nov 5
£3,116 GBP
$4,194 USD
View
16 more retailers have this diamond
Prices start from £951 GBPSave up to £2,165 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
£951 GBP