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Radiant|Natural|GIA

1.21ct F SI1 Radiant Natural Diamond

GD • F/SI1 • GIA 1279100240

Certificate GIA 1279100240

Diamond specifications and retailer prices

From £3,736 GBP
As of November 6, 2026
Save £868 GBP (19%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £4,605 GBP at 77 Diamonds · As of November 5, 2026
View at 77 Diamonds

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 1279100240. Listed at 6 retailers as of November 5, 2026, with prices from £3,736 to £4,605, a £868 spread on the same certified stone. 77 Diamonds lists it at £4,605. 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

1.21
Carat
F
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1279100240
Dimensions5.74 × 5.31 × 4.22 mm
L/W Ratio1.08
Top View
5.74 mm5.31 mm1.21 ctF / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 1279100240
Side View
Table 68.0%CrownGirdle: ThickPavilionCulet: NoneDepth 79.4%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £4,605 GBP|Low: £3,736 GBP|High: £4,664 GBP|Avg: £4,210 GBP|-0.1%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 2£3,736 GBP
Retailer 6£3,959 GBP
Retailer 3£3,963 GBP
Retailer 5£4,064 GBP
Retailer 4£4,539 GBP
77 Diamonds£4,605 GBP

39 data points across 6 retailers

6 retailers£3,736 GBP to £4,605 GBP

B
Cheapest Retailer
-
£3,736 GBP
B
Retailer 2
-
£3,959 GBP
View
Retailer 3
-
£3,963 GBP
View
Price last confirmed 10 days ago
B
Retailer 4
-
£4,064 GBP
View
Retailer 5
-
£4,539 GBP
View
Price last confirmed 9 days ago
Most Expensive
B
77 Diamonds
RADZYSVFQSTP · Nov 5
£4,605 GBP
View
5 more retailers have this diamond
Prices start from £3,736 GBPSave up to £868 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
£3,736 GBP