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Round|Natural|GIA

1.21ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 5423150018

Certificate GIA 5423150018

Diamond specifications and retailer prices

From £1,510 GBP
As of November 6, 2026
Save £2,416 GBP (62%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £3,927 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 K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5423150018. Listed at 9 retailers as of November 5, 2026, with prices from £1,510 to £3,927, a £2,416 spread on the same certified stone. NZ Jewellers lists it at £3,927. 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
K
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 5423150018
Dimensions6.83 × 6.79 × 4.26 mm
L/W Ratio1.01
Top View
6.83 mm6.79 mm1.21 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5423150018
Side View
Table 55.0%Crown 35.5°GirdlePavilion 41°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 6
Current: £3,927 GBP|Low: £1,510 GBP|High: £3,927 GBP|Avg: £2,526 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 5£1,510 GBP
Retailer 6£1,780 GBP
Retailer 2£1,995 GBP
Retailer 3£2,337 GBP
Retailer 4£3,308 GBP
NZ Jewellers£3,927 GBP

42 data points across 6 retailers

9 retailers£1,510 GBP to £3,927 GBP

A
Cheapest Retailer
-
£1,510 GBP
B+
Retailer 2
-
£1,701 GBP
View
B+
Retailer 3
-
£1,780 GBP
View
B
Retailer 4
-
£1,964 GBP
View
B+
Retailer 5
-
£1,995 GBP
View
B
Retailer 6
-
£2,337 GBP
View
B
Retailer 7
-
£2,730 GBP
View
Retailer 8
-
£3,308 GBP
View
Price last confirmed 8 days ago
Most Expensive
C
NZ Jewellers
6d102739-0765-4f66-bfa8-7da1dfd07ccb · Nov 5
£3,927 GBP
$5,285 USD
View
8 more retailers have this diamond
Prices start from £1,510 GBPSave up to £2,416 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
£1,510 GBP