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Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 2243122857

Certificate GIA 2243122857

Diamond specifications and retailer prices

From £1,636 GBP
As of November 6, 2026
Save £1,320 GBP (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,956 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2243122857. Listed at 12 retailers as of November 6, 2026, with prices from £1,636 to £2,956, a £1,320 spread on the same certified stone. Helzberg Diamonds lists it at £2,956. 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
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle34°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2243122857
Dimensions6.81 × 6.83 × 4.25 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.81 mm6.83 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2243122857
Side View
Table 56.0%Crown 34°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.3%

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: Nov 6
Current: £2,956 GBP|Low: £1,636 GBP|High: £2,956 GBP|Avg: £2,151 GBP
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 2£1,636 GBP
Retailer 7£1,755 GBP
Retailer 3£1,787 GBP
Retailer 11£1,796 GBP
Retailer 8£1,853 GBP
Retailer 5£2,054 GBP
Retailer 10£2,056 GBP
Retailer 6£2,069 GBP
Retailer 9£2,108 GBP
Retailer 12£2,515 GBP
Retailer 4£2,689 GBP
Helzberg Diamonds£2,956 GBP

3 data points across 12 retailers

12 retailers£1,636 GBP to £2,956 GBP

A
Cheapest Retailer
-
£1,636 GBP
B+
Retailer 2
-
£1,755 GBP
View
B+
Retailer 3
-
£1,787 GBP
View
B+
Retailer 4
-
£1,796 GBP
View
B+
Retailer 5
-
£1,853 GBP
View
B
Retailer 6
-
£2,054 GBP
View
B
Retailer 7
-
£2,056 GBP
View
B+
Retailer 8
-
£2,069 GBP
View
B
Retailer 9
-
£2,108 GBP
View
B
Retailer 10
-
£2,515 GBP
View
B
Retailer 11
-
£2,689 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRIIKJHIIOLN · Nov 6
£2,956 GBP
$3,957 USD
View
11 more retailers have this diamond
Prices start from £1,636 GBPSave up to £1,320 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 Round
£1,636 GBP