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Radiant|Natural|GIA

1.21ct J SI2 Radiant Natural Diamond

EX • J/SI2 • GIA 1555663793

Certificate GIA 1555663793

Diamond specifications and retailer prices

From £1,267 GBP
$1,698 USD
As of October 28, 2026
Save £1,004 GBP (44%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £2,271 GBP at Helzberg Diamonds · As of October 28, 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 SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1555663793. Listed at 10 retailers as of October 28, 2026, with prices from £1,267 to £2,271, a £1,004 spread on the same certified stone. Helzberg Diamonds lists it at £2,271. 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
J
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1555663793
Dimensions7.41 × 5.28 × 3.45 mm
L/W Ratio1.40
Culet sizeNone
Top View
7.41 mm5.28 mm1.21 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1555663793
Side View
Table 68.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 65.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 28
Current: £2,271 GBP|Low: £1,267 GBP|High: £2,461 GBP|Avg: £1,755 GBP|-7.7%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 29, 2026
Retailer 4£1,267 GBP
Retailer 5£1,267 GBP
Retailer 9£1,380 GBP
Retailer 6£1,393 GBP
Retailer 7£1,520 GBP
Retailer 3£1,590 GBP
Retailer 8£1,657 GBP
Retailer 2£1,785 GBP
Retailer 10£2,086 GBP
Helzberg Diamonds£2,271 GBP

37 data points across 10 retailers

10 retailers£1,267 GBP to £2,271 GBP

A
Cheapest Retailer
-
£1,267 GBP
$1,698 USD
A
Retailer 2
-
£1,267 GBP
$1,698 USD
View
A
Retailer 3
-
£1,380 GBP
SGD 2,498 SGD
View
A
Retailer 4
-
£1,393 GBP
View
B+
Retailer 5
-
£1,520 GBP
$2,037 USD
View
B+
Retailer 6
-
£1,590 GBP
$2,130 USD
View
B+
Retailer 7
-
£1,657 GBP
$2,221 USD
View
B+
Retailer 8
-
£1,785 GBP
€2,278 EUR
View
B+
Retailer 9
-
£2,086 GBP
$2,795 USD
View
Most Expensive
B
Helzberg Diamonds
XZRHLLLMMJNPJ · Oct 28
£2,271 GBP
$3,043 USD
View
9 more retailers have this diamond
Prices start from £1,267 GBPSave up to £1,004 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.

A
1.21ct Radiant
£1,267 GBP