Radiant|Natural|GIA

1.21ct J SI1 Radiant Natural Diamond

VG • J/SI1 • GIA 2245114745

Certificate GIA 2245114745

Diamond specifications and retailer prices

From £1,459 GBP
As of November 4, 2026
Save £1,180 GBP (45%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,639 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.21ct natural radiant diamond

This 1.21ct natural radiant sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 2245114745. Listed at 11 retailers as of November 4, 2026, with prices from £1,459 to £2,639, a £1,180 spread on the same certified stone. Helzberg Diamonds lists it at £2,639. 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
J
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2245114745
Dimensions7.09 × 5.43 × 3.74 mm
L/W Ratio1.31
Top View
7.09 mm5.43 mm1.21 ctJ / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2245114745
Side View
Table 70.0%CrownGirdle: Slightly ThickPavilionCulet: NoneDepth 68.9%

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 4
Current: £2,639 GBP|Low: £1,459 GBP|High: £2,639 GBP|Avg: £1,799 GBP
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 7, 2026
Retailer 9£1,459 GBP
Retailer 10£1,472 GBP
Retailer 8£1,476 GBP
Retailer 3£1,603 GBP
Retailer 2£1,609 GBP
Retailer 5£1,751 GBP
Retailer 11£1,871 GBP
Retailer 4£2,068 GBP
Retailer 7£2,244 GBP
Retailer 6£2,422 GBP
Helzberg Diamonds£2,639 GBP

8 data points across 11 retailers

11 retailers£1,459 GBP to £2,639 GBP

B+
Cheapest Retailer
-
£1,459 GBP
B+
Retailer 2
-
£1,472 GBP
View
B+
Retailer 3
-
£1,476 GBP
View
B+
Retailer 4
-
£1,603 GBP
View
B+
Retailer 5
-
£1,609 GBP
View
B+
Retailer 6
-
£1,751 GBP
View
B
Retailer 7
-
£1,871 GBP
View
B
Retailer 8
-
£2,068 GBP
View
B
Retailer 9
-
£2,244 GBP
View
B
Retailer 10
-
£2,422 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRIIKLHHKNKL · Nov 6
£2,639 GBP
$3,532 USD
View
10 more retailers have this diamond
Prices start from £1,459 GBPSave up to £1,180 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
£1,459 GBP