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Radiant|Natural|GIA

1.21ct D SI1 Radiant Natural Diamond

EX • D/SI1 • GIA 6561517299

Certificate GIA 6561517299

Diamond specifications and retailer prices

From £3,092 GBP
As of November 6, 2026
Save £2,334 GBP (43%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £5,425 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6561517299. Listed at 5 retailers as of November 4, 2026, with prices from £3,092 to £5,425, a £2,334 spread on the same certified stone. MOH London lists it at £5,425. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle47.89°
OriginNatural
Grading LabGIA
CertificateGIA 6561517299
Dimensions7.17 × 5.38 × 3.64 mm
L/W Ratio1.33
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud, Needle
Top View
7.17 mm5.38 mm1.21 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6561517299
Side View
Table 68.0%Crown 47.89°Girdle: Sli. Thick - ThickPavilionCulet: NoneDepth 67.7%

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: £5,425 GBP|Low: £3,041 GBP|High: £5,670 GBP|Avg: £3,791 GBP|-4.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 7, 2026
Retailer 5£3,041 GBP
Retailer 4£3,092 GBP
Retailer 2£3,362 GBP
Retailer 3£3,842 GBP
MOH London£5,425 GBP

23 data points across 5 retailers

5 retailers£3,092 GBP to £5,425 GBP

Retailer 1
-
£3,041 GBP
Price last confirmed 13 days ago
B+
Retailer 2
-
£3,092 GBP
View
B+
Retailer 3
-
£3,362 GBP
View
B+
Retailer 4
-
£3,842 GBP
View
Most Expensive
B
MOH London
0DAA789FB · Nov 4
£5,425 GBP
View
4 more retailers have this diamond
Prices start from £3,092 GBPSave up to £2,334 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
£3,092 GBP