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Round|Natural|GIA

1.21ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 6431629525

Certificate GIA 6431629525

Diamond specifications and retailer prices

From £2,089 GBP
As of November 1, 2026
Save £2,217 GBP (51%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: £4,485 GBP at NZ Jewellers · As of October 17, 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6431629525. Listed at 23 retailers as of November 1, 2026, with a 106% 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6431629525
Dimensions6.84 × 6.80 × 4.23 mm
L/W Ratio1.01
Top View
6.84 mm6.80 mm1.21 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6431629525
Side View
Table 56.0%Crown 35.5°Girdle: MediumPavilion 40.8°Culet: NoneDepth 62.1%

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 1
Current: £3,754 GBP|Low: £2,089 GBP|High: £4,445 GBP|Avg: £2,845 GBP|-2.9%
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
Retailer 15
Retailer 16
Retailer 17
Retailer 18
November 3, 2026
Retailer 15£2,089 GBP
Retailer 13£2,118 GBP
Retailer 16£2,137 GBP
Retailer 7£2,199 GBP
Retailer 9£2,347 GBP
Retailer 4£2,441 GBP
Retailer 3£2,552 GBP
Retailer 6£2,574 GBP
Retailer 17£2,652 GBP
Retailer 18£2,652 GBP
Retailer 12£2,674 GBP
Retailer 5£2,713 GBP
Retailer 2£2,742 GBP
Retailer 11£2,853 GBP
Retailer 8£3,063 GBP
Retailer 1£3,754 GBP
Retailer 14£4,306 GBP
Retailer 10£4,445 GBP

22 data points across 18 retailers

23 retailers£2,089 GBP to £4,306 GBP

A
Cheapest Retailer
-
£2,089 GBP
A
Retailer 2
-
£2,118 GBP
View
A
Retailer 3
-
£2,137 GBP
View
Retailer 4
-
£2,199 GBP
View
Price last confirmed 18 days ago
B+
Retailer 5
-
£2,347 GBP
View
B+
Retailer 6
-
£2,441 GBP
View
B+
Retailer 7
-
£2,552 GBP
View
Retailer 8
-
£2,574 GBP
View
Price last confirmed 56 days ago
Retailer 9
-
£2,574 GBP
View
Price last confirmed 21 days ago
Retailer 10
-
£2,574 GBP
View
Price last confirmed 19 days ago
B+
Retailer 11
-
£2,652 GBP
View
B+
Retailer 12
-
£2,652 GBP
View
Retailer 13
-
£2,673 GBP
View
Price last confirmed 22 days ago
B+
Retailer 14
-
£2,674 GBP
View
B+
Retailer 15
-
£2,713 GBP
View
B
Retailer 16
-
£2,742 GBP
View
B
Retailer 17
-
£2,853 GBP
View
Retailer 18
-
£2,970 GBP
View
Price last confirmed 60 days ago
Retailer 19
-
£2,970 GBP
View
Price last confirmed 19 days ago
B
Retailer 20
-
£3,754 GBP
View
B
Retailer 21
-
£4,306 GBP
View
Retailer 22
-
£4,485 GBP
View
Price last confirmed 57 days ago
Most Expensive
NZ Jewellers
ed3d6f6b-3ec0-4861-8c13-5b12bee53f86 · Oct 17
£4,485 GBP
$6,037 USD
View
Price last confirmed 20 days ago
22 more retailers have this diamond
Prices start from £2,089 GBPSave up to £2,217 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
£2,089 GBP