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Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 2556873938

Certificate GIA 2556873938

Diamond specifications and retailer prices

From £1,414 GBP
As of November 5, 2026
Save £930 GBP (40%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £3,319 GBP at Helzberg Diamonds · As of September 27, 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 2556873938. Listed at 15 retailers as of November 5, 2026, with a 66% 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
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 2556873938
Dimensions6.75 × 6.79 × 4.24 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.75 mm6.79 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556873938
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.6%

Caratlytics Score

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

Price History

Last verified: Nov 5
Current: £1,417 GBP|Low: £1,414 GBP|High: £2,520 GBP|Avg: £1,745 GBP|-7.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 6, 2026
Retailer 14£1,414 GBP
Retailer 1£1,417 GBP
Retailer 9£1,423 GBP
Retailer 11£1,429 GBP
Retailer 12£1,434 GBP
Retailer 7£1,463 GBP
Retailer 8£1,553 GBP
Retailer 5£1,556 GBP
Retailer 3£1,703 GBP
Retailer 10£1,807 GBP
Retailer 4£1,827 GBP
Retailer 6£2,158 GBP
Retailer 13£2,179 GBP
Retailer 2£2,344 GBP

37 data points across 14 retailers

15 retailers£1,414 GBP to £2,344 GBP

A
Cheapest Retailer
-
£1,414 GBP
A
Retailer 2
-
£1,417 GBP
View
A
Retailer 3
-
£1,423 GBP
View
A
Retailer 4
-
£1,429 GBP
View
A
Retailer 5
-
£1,434 GBP
View
A
Retailer 6
-
£1,463 GBP
View
A
Retailer 7
-
£1,553 GBP
View
A
Retailer 8
-
£1,556 GBP
View
B+
Retailer 9
-
£1,703 GBP
View
B+
Retailer 10
-
£1,807 GBP
View
B+
Retailer 11
-
£1,827 GBP
View
B+
Retailer 12
-
£1,869 GBP
View
B+
Retailer 13
-
£2,179 GBP
View
B+
Retailer 14
-
£2,344 GBP
View
Most Expensive
Helzberg Diamonds
XZRILLKOOLOHO · Sep 27
£3,319 GBP
$4,443 USD
View
Price last confirmed 40 days ago
14 more retailers have this diamond
Prices start from £1,414 GBPSave up to £930 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
£1,414 GBP