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Round|Natural|GIA

1.21ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 1537184144

Certificate GIA 1537184144

Diamond specifications and retailer prices

From £817 GBP
As of November 6, 2026
Save £1,883 GBP (70%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,701 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 M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1537184144. Listed at 12 retailers as of November 5, 2026, with prices from £817 to £2,701, a £1,883 spread on the same certified stone. NZ Jewellers lists it at £2,701. 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
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1537184144
Dimensions6.75 × 6.79 × 4.22 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal, Feather, Cloud, Needle
Top View
6.75 mm6.79 mm1.21 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1537184144
Side View
Table 57.0%Crown 36°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.4%

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 6
Current: £1,088 GBP|Low: £817 GBP|High: £1,540 GBP|Avg: £1,127 GBP|-1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8£817 GBP
Retailer 2£828 GBP
Retailer 6£1,027 GBP
Retailer 1£1,088 GBP
Retailer 7£1,158 GBP
Retailer 5£1,178 GBP
Retailer 3£1,351 GBP
Retailer 4£1,531 GBP

42 data points across 8 retailers

12 retailers£817 GBP to £2,701 GBP

A
Cheapest Retailer
-
£817 GBP
A
Retailer 2
-
£828 GBP
View
B+
Retailer 3
-
£1,027 GBP
View
A
Retailer 4
-
£1,088 GBP
View
B+
Retailer 5
-
£1,107 GBP
View
Retailer 6
-
£1,107 GBP
View
Price last confirmed 8 days ago
B+
Retailer 7
-
£1,158 GBP
View
B+
Retailer 8
-
£1,178 GBP
View
B+
Retailer 9
-
£1,277 GBP
View
B+
Retailer 10
-
£1,351 GBP
View
B+
Retailer 11
-
£1,531 GBP
View
Most Expensive
C
NZ Jewellers
b749ebb2-c399-4b76-b0fb-19c871a8799a · Nov 5
£2,701 GBP
$3,635 USD
View
11 more retailers have this diamond
Prices start from £817 GBPSave up to £1,883 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
£817 GBP