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Round|Natural|GIA

1.00ct J SI2 Round Natural Diamond

VG • J/SI2 • GIA 1559494856

Certificate GIA 1559494856

Diamond specifications and retailer prices

From £989 GBP
As of November 4, 2026
Save £2,150 GBP (68%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £3,139 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 very-good cut grade and certified by GIA 1559494856. Listed at 20 retailers as of November 4, 2026, with prices from £989 to £3,139, a £2,150 spread on the same certified stone. NZ Jewellers lists it at £3,139. 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
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle38°
Pavilion angle40.2°
OriginNatural
Grading LabGIA
CertificateGIA 1559494856
Dimensions6.18 × 6.24 × 3.98 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Feather, Crystal, Cavity, Needle, Indented Natural, Natural
Top View
6.18 mm6.24 mm1.00 ctJ / SI2
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 1559494856
Side View
Table 59.0%Crown 38°Girdle: STK-THKPavilion 40.2°Culet: NoneDepth 64.1%

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 4
Current: £1,380 GBP|Low: £989 GBP|High: £2,282 GBP|Avg: £1,429 GBP
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 10£989 GBP
Retailer 6£999 GBP
Retailer 2£1,187 GBP
Retailer 7£1,205 GBP
Retailer 11£1,282 GBP
Retailer 1£1,380 GBP
Retailer 4£1,420 GBP
Retailer 3£1,433 GBP
Retailer 5£1,495 GBP
Retailer 8£1,690 GBP
Retailer 9£2,248 GBP

32 data points across 11 retailers

20 retailers£989 GBP to £3,139 GBP

A
Cheapest Retailer
-
£989 GBP
A
Retailer 2
-
£999 GBP
View
B+
Retailer 3
-
£1,172 GBP
View
B+
Retailer 4
-
£1,187 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,205 GBP
View
B+
Retailer 6
-
£1,282 GBP
View
B+
Retailer 7
-
£1,287 GBP
View
Retailer 8
-
£1,287 GBP
View
Price last confirmed 8 days ago
B+
Retailer 9
-
£1,346 GBP
View
B+
Retailer 10
-
£1,380 GBP
View
B+
Retailer 11
-
£1,389 GBP
View
B+
Retailer 12
-
£1,402 GBP
View
B+
Retailer 13
-
£1,420 GBP
View
B+
Retailer 14
-
£1,433 GBP
View
B+
Retailer 15
-
£1,485 GBP
View
B+
Retailer 16
-
£1,495 GBP
View
B
Retailer 17
-
£1,690 GBP
View
B
Retailer 18
-
£1,917 GBP
View
B
Retailer 19
-
£2,248 GBP
View
Most Expensive
C
NZ Jewellers
487f54e0-6499-4d20-a69f-4a5bfdf0dac6 · Nov 5
£3,139 GBP
$4,225 USD
View
19 more retailers have this diamond
Prices start from £989 GBPSave up to £2,150 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
£989 GBP