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Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6512424390

Certificate GIA 6512424390

Diamond specifications and retailer prices

From £2,881 GBP
As of November 5, 2026
Save £2,822 GBP (49%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £5,703 GBP at NZ Jewellers · As of November 5, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6512424390. Listed at 17 retailers as of November 5, 2026, with prices from £2,881 to £5,703, a £2,822 spread on the same certified stone. NZ Jewellers lists it at £5,703. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6512424390
Dimensions6.86 × 6.81 × 4.22 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Twinning Wisp, Feather, Needle, Indented Natural
Top View
6.86 mm6.81 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6512424390
Side View
Table 60.0%Crown 34.5°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 61.7%

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: Nov 5
Current: £3,295 GBP|Low: £2,518 GBP|High: £5,407 GBP|Avg: £3,475 GBP|+1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 5£2,903 GBP
Retailer 2£2,971 GBP
Retailer 7£3,021 GBP
Retailer 9£3,111 GBP
Retailer 10£3,273 GBP
Retailer 1£3,295 GBP
Retailer 8£3,491 GBP
Retailer 4£3,680 GBP
Retailer 3£3,993 GBP
Retailer 6£5,343 GBP

45 data points across 10 retailers

17 retailers£2,881 GBP to £5,703 GBP

B+
Cheapest Retailer
-
£2,881 GBP
B+
Retailer 2
-
£2,903 GBP
View
B+
Retailer 3
-
£2,971 GBP
View
B+
Retailer 4
-
£3,021 GBP
View
Final sale: no returns
B+
Retailer 5
-
£3,104 GBP
View
Retailer 6
-
£3,273 GBP
View
Price last confirmed 8 days ago
B
Retailer 7
-
£3,273 GBP
View
B
Retailer 8
-
£3,273 GBP
View
B+
Retailer 9
-
£3,295 GBP
View
B
Retailer 10
-
£3,384 GBP
View
Retailer 11
-
£3,491 GBP
View
Price last confirmed 28 days ago
B
Retailer 12
-
£3,680 GBP
View
B
Retailer 13
-
£3,777 GBP
View
B
Retailer 14
-
£3,993 GBP
View
B
Retailer 15
-
£5,201 GBP
View
B
Retailer 16
-
£5,343 GBP
View
Most Expensive
B
NZ Jewellers
26c924ad-4a91-43a5-8d77-a32aea1d223a · Nov 5
£5,703 GBP
$7,633 USD
View
16 more retailers have this diamond
Prices start from £2,881 GBPSave up to £2,822 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
£2,881 GBP