Round|Natural|GIA

1.21ct E SI2 Round Natural Diamond

EX • E/SI2 • GIA 2557157855

Certificate GIA 2557157855

Diamond specifications and retailer prices

From £2,570 GBP
$3,443 USD
As of October 30, 2026
Save £2,591 GBP (50%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £5,615 GBP at NZ Jewellers · As of September 28, 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 E colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2557157855. Listed at 14 retailers as of October 29, 2026, with a 101% 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
E
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2557157855
Dimensions6.80 × 6.82 × 4.22 mm
L/W Ratio1.00
Star length50%
Top View
6.80 mm6.82 mm1.21 ctE / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2557157855
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.9%

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: Oct 30
Current: £3,277 GBP|Low: £2,570 GBP|High: £5,196 GBP|Avg: £3,504 GBP|+2.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 6£2,570 GBP
Retailer 3£2,853 GBP
Retailer 1£3,277 GBP
Retailer 9£3,299 GBP
Retailer 10£3,299 GBP
Retailer 2£3,403 GBP
Retailer 4£3,450 GBP
Retailer 7£3,646 GBP
Retailer 8£3,836 GBP
Retailer 5£5,161 GBP

32 data points across 10 retailers

14 retailers£2,570 GBP to £5,161 GBP

A
Cheapest Retailer
-
£2,570 GBP
$3,443 USD
B+
Retailer 2
-
£2,853 GBP
View
Retailer 3
-
£2,920 GBP
$3,913 USD
View
Price last confirmed 22 days ago
Retailer 4
-
£2,920 GBP
$3,913 USD
View
Price last confirmed 23 days ago
Retailer 5
-
£2,920 GBP
$3,913 USD
View
Price last confirmed 31 days ago
B+
Retailer 6
-
£3,277 GBP
View
B+
Retailer 7
-
£3,299 GBP
$4,420 USD
View
B+
Retailer 8
-
£3,299 GBP
$4,420 USD
View
Retailer 9
-
£3,370 GBP
$4,515 USD
View
Price last confirmed 22 days ago
B+
Retailer 10
-
£3,403 GBP
$4,560 USD
View
B+
Retailer 11
-
£3,450 GBP
€4,402 EUR
View
Retailer 12
-
£3,646 GBP
$4,885 USD
View
Price last confirmed 8 days ago
B
Retailer 13
-
£5,161 GBP
View
Most Expensive
NZ Jewellers
c50702df-7f2f-4dee-9107-310b0574e00e · Sep 28
£5,615 GBP
$7,524 USD
View
Price last confirmed 33 days ago
13 more retailers have this diamond
Prices start from £2,570 GBPSave up to £2,591 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
£2,570 GBP