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1.23ct I SI2 Round Natural Diamond

EX • I/SI2 • GSI 98227800101

Certificate GSI 98227800101

Diamond specifications and retailer prices

From £4,373 GBP
$5,860 USD
As of October 30, 2026
6 retailers carry this diamond
Most expensive: £7,925 GBP at NZ Jewellers · As of October 23, 2026
View at NZ Jewellers

About this 1.23ct natural round diamond

This 1.23ct 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 GSI 98227800101. Listed at 6 retailers as of October 30, 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

1.23
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle32.5°
Pavilion angle39.6°
OriginNatural
Grading LabGSI
CertificateGSI 98227800101
Dimensions7.06 × 7.02 × 4.00 mm
L/W Ratio1.01
Top View
7.06 mm7.02 mm1.23 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGSI 98227800101
Side View
Table 64.0%Crown 32.5°GirdlePavilion 39.6°Culet: NoneDepth 56.8%

Caratlytics Score

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C
Average
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Price History

Last verified: Oct 30
Current: £7,925 GBP|Low: £3,099 GBP|High: £7,925 GBP|Avg: £5,121 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 10, 2026
Retailer 7£3,099 GBP
Retailer 2£4,373 GBP
Retailer 3£4,738 GBP
Retailer 4£4,738 GBP
Retailer 5£4,738 GBP
Retailer 6£5,468 GBP
NZ Jewellers£7,925 GBP

5 data points across 7 retailers

6 retailers

C
Cheapest Retailer
-
£4,373 GBP
$5,860 USD
Final sale: no returns
Retailer 2
-
£4,738 GBP
$6,349 USD
View
Price last confirmed 7 days ago
Retailer 3
-
£4,738 GBP
$6,349 USD
View
Price last confirmed 9 days ago
Retailer 4
-
£4,738 GBP
$6,349 USD
View
Price last confirmed 9 days ago
Retailer 5
-
£5,468 GBP
$7,326 USD
View
Price last confirmed 8 days ago
Most Expensive
NZ Jewellers
97080fce-ac01-4393-8b85-1131560bb0e3 · Oct 23
£7,925 GBP
$10,619 USD
View
Price under review
5 more retailers have this diamond
Prices start from £4,373 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.

C
1.23ct Round
£4,373 GBP