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Round|Natural|GIA

1.21ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 1558575382

Certificate GIA 1558575382

Diamond specifications and retailer prices

From £1,748 GBP
As of October 27, 2026
Save £1,429 GBP (45%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £3,786 GBP at NZ Jewellers · As of October 3, 2026
View at NZ Jewellers

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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1558575382. Listed at 9 retailers as of October 26, 2026, with a 82% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 1558575382
Dimensions6.79 × 6.75 × 4.27 mm
L/W Ratio1.01
Star length50%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Feather, Crystal, Needle
Top View
6.79 mm6.75 mm1.21 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558575382
Side View
Table 58.0%Crown 34.5°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 63.1%

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: Oct 27
Current: £1,748 GBP|Low: £1,671 GBP|High: £3,322 GBP|Avg: £2,183 GBP|+0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 27, 2026
Retailer 5£1,671 GBP
Retailer 1£1,748 GBP
Retailer 6£1,811 GBP
Retailer 2£1,912 GBP
Retailer 7£1,933 GBP
Retailer 8£2,230 GBP
Retailer 3£2,252 GBP
Retailer 4£3,177 GBP

24 data points across 8 retailers

9 retailers£1,748 GBP to £3,177 GBP

B+
Cheapest Retailer
-
£1,748 GBP
Retailer 2
-
£1,811 GBP
$2,426 USD
View
Price last confirmed 24 days ago
B+
Retailer 3
-
£1,912 GBP
View
Retailer 4
-
£1,933 GBP
$2,590 USD
View
Price last confirmed 26 days ago
Retailer 5
-
£1,960 GBP
$2,626 USD
View
Price last confirmed 32 days ago
Retailer 6
-
£2,090 GBP
$2,800 USD
View
Price last confirmed 30 days ago
B+
Retailer 7
-
£2,252 GBP
€2,874 EUR
View
B
Retailer 8
-
£3,177 GBP
View
Most Expensive
NZ Jewellers
50c333c1-2b01-4ff0-948a-165c10d14888 · Oct 3
£3,786 GBP
$5,073 USD
View
Price last confirmed 29 days ago
8 more retailers have this diamond
Prices start from £1,748 GBPSave up to £1,429 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 Round
£1,748 GBP