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Radiant|Natural|GIA

1.21ct I SI2 Radiant Natural Diamond

EX • I/SI2 • GIA 2556128158

Certificate GIA 2556128158

Diamond specifications and retailer prices

From £1,849 GBP
As of November 7, 2026
5 retailers carry this diamond
Most expensive: £3,963 GBP at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2556128158. Listed at 5 retailers as of November 7, 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

1.21
Carat
I
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2556128158
Dimensions7.11 × 5.26 × 3.57 mm
L/W Ratio1.35
Top View
7.11 mm5.26 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556128158
Side View
Table 66.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 67.9%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 7
Current: £1,790 GBP|Low: £1,396 GBP|High: £3,456 GBP|Avg: £2,015 GBP|-0.3%
Retailer 1
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
Retailer 15
Retailer 16
Retailer 17
October 6, 2026
Retailer 10£1,396 GBP
Retailer 17£1,421 GBP
Retailer 11£1,431 GBP
Retailer 12£1,537 GBP
Retailer 4£1,668 GBP
Retailer 13£1,748 GBP
Retailer 15£1,765 GBP
Retailer 1£1,790 GBP
Retailer 5£1,849 GBP
Retailer 7£1,942 GBP
Retailer 8£1,942 GBP
Retailer 9£2,010 GBP
Retailer 2£2,315 GBP
Retailer 6£2,371 GBP
Retailer 14£2,660 GBP
Retailer 3£2,867 GBP
Retailer 16£3,309 GBP

12 data points across 17 retailers

5 retailers

Retailer 1
-
£1,396 GBP
Price last confirmed 33 days ago
Retailer 2
-
£1,748 GBP
View
Price last confirmed 34 days ago
B+
Retailer 3
-
£1,849 GBP
View
Retailer 4
-
£3,309 GBP
View
Price last confirmed 33 days ago
Most Expensive
NZ Jewellers
43dc02b9-5f31-4cb3-aa5c-7ce9f778202a · Sep 25
£3,963 GBP
$5,305 USD
View
Price last confirmed 42 days ago
4 more retailers have this diamond
Prices start from £1,849 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+
1.21ct Radiant
£1,849 GBP