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Round|Natural|GIA

1.00ct J SI1 Round Natural Diamond

VG • J/SI1 • GIA 5423535519

Certificate GIA 5423535519

Diamond specifications and retailer prices

From £1,301 GBP
As of November 6, 2026
Save £2,101 GBP (62%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £3,402 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 very-good cut grade and certified by GIA 5423535519. Listed at 20 retailers as of November 5, 2026, with prices from £1,301 to £3,402, a £2,101 spread on the same certified stone. NZ Jewellers lists it at £3,402. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.00
Carat
J
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
Crown angle38.5°
Pavilion angle39.8°
OriginNatural
Grading LabGIA
CertificateGIA 5423535519
Dimensions6.30 × 6.25 × 3.97 mm
L/W Ratio1.01
Top View
6.30 mm6.25 mm1.00 ctJ / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5423535519
Side View
Table 57.0%Crown 38.5°Girdle: STK-THKPavilion 39.8°Culet: NoneDepth 63.3%

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: £1,896 GBP|Low: £1,169 GBP|High: £2,885 GBP|Avg: £1,862 GBP|-0.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 7£1,331 GBP
Retailer 9£1,360 GBP
Retailer 8£1,371 GBP
Retailer 2£1,542 GBP
Retailer 5£1,757 GBP
Retailer 1£1,896 GBP
Retailer 4£1,986 GBP
Retailer 10£2,001 GBP
Retailer 3£2,063 GBP
Retailer 6£2,843 GBP

42 data points across 10 retailers

20 retailers£1,301 GBP to £3,402 GBP

B+
Cheapest Retailer
-
£1,301 GBP
B+
Retailer 2
-
£1,328 GBP
View
B+
Retailer 3
-
£1,331 GBP
View
B+
Retailer 4
-
£1,360 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,371 GBP
View
B+
Retailer 6
-
£1,386 GBP
View
Retailer 7
-
£1,474 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£1,474 GBP
View
B
Retailer 9
-
£1,501 GBP
View
B+
Retailer 10
-
£1,542 GBP
View
B
Retailer 11
-
£1,684 GBP
View
B
Retailer 12
-
£1,701 GBP
View
B
Retailer 13
-
£1,757 GBP
View
B
Retailer 14
-
£1,874 GBP
View
B
Retailer 15
-
£1,896 GBP
View
B
Retailer 16
-
£1,986 GBP
View
Retailer 17
-
£2,001 GBP
View
Price last confirmed 31 days ago
B
Retailer 18
-
£2,063 GBP
View
B
Retailer 19
-
£2,843 GBP
View
Most Expensive
C
NZ Jewellers
9ae6d256-84b7-426f-a4bd-e2661672ff5a · Nov 5
£3,402 GBP
$4,579 USD
View
19 more retailers have this diamond
Prices start from £1,301 GBPSave up to £2,101 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
£1,301 GBP