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Round|Natural|GIA

1.00ct I SI2 Round Natural Diamond

ID • I/SI2 • GIA 1223

Certificate GIA 1223

Diamond specifications and retailer prices

From £967 GBP
As of November 4, 2026
Save £1,577 GBP (62%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £2,545 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 16 retailers as of November 4, 2026, with prices from £967 to £2,545, a £1,577 spread on the same certified stone. NZ Jewellers lists it at £2,545. 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
I
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1223
Dimensions6.44 × 6.48 × 3.92 mm
L/W Ratio1.01
Top View
6.44 mm6.48 mm1.00 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1223
Side View
Table 59.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 60.8%

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 4
Current: £2,545 GBP|Low: £967 GBP|High: £2,687 GBP|Avg: £1,386 GBP|-5.3%
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
November 6, 2026
Retailer 8£967 GBP
Retailer 2£984 GBP
Retailer 11£1,043 GBP
Retailer 4£1,073 GBP
Retailer 12£1,091 GBP
Retailer 3£1,116 GBP
Retailer 10£1,143 GBP
Retailer 13£1,204 GBP
Retailer 7£1,347 GBP
Retailer 14£1,413 GBP
Retailer 6£1,453 GBP
Retailer 5£1,685 GBP
Retailer 9£1,906 GBP
NZ Jewellers£2,545 GBP

32 data points across 14 retailers

16 retailers£967 GBP to £2,545 GBP

A
Cheapest Retailer
-
£967 GBP
A
Retailer 2
-
£984 GBP
View
A
Retailer 3
-
£1,043 GBP
View
Retailer 4
-
£1,073 GBP
View
Price last confirmed 8 days ago
A
Retailer 5
-
£1,091 GBP
View
A
Retailer 6
-
£1,116 GBP
View
A
Retailer 7
-
£1,120 GBP
View
A
Retailer 8
-
£1,143 GBP
View
A
Retailer 9
-
£1,204 GBP
View
A
Retailer 10
-
£1,347 GBP
View
A
Retailer 11
-
£1,386 GBP
View
Retailer 12
-
£1,413 GBP
View
Price last confirmed 16 days ago
Retailer 13
-
£1,453 GBP
View
Price last confirmed 33 days ago
Retailer 14
-
£1,685 GBP
View
Price last confirmed 15 days ago
B+
Retailer 15
-
£1,906 GBP
View
Most Expensive
B+
NZ Jewellers
688d6296-1ba7-4585-9024-79ef1b351d01 · Nov 5
£2,545 GBP
$3,425 USD
View
15 more retailers have this diamond
Prices start from £967 GBPSave up to £1,577 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
£967 GBP