Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 3515861632

Certificate GIA 3515861632

Diamond specifications and retailer prices

From £3,177 GBP
As of November 5, 2026
Save £551 GBP (15%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £6,046 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 3515861632. Listed at 19 retailers as of November 2, 2026, with a relatively tight 17% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
FluorescenceFaint
Crown angle33.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 3515861632
Dimensions6.95 × 6.92 × 4.16 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
6.95 mm6.92 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 3515861632
Side View
Table 59.0%Crown 33.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 60.0%

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: £3,727 GBP|Low: £2,767 GBP|High: £5,594 GBP|Avg: £3,569 GBP|-1.3%
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
November 2, 2026
Retailer 13£2,767 GBP
Retailer 14£2,809 GBP
Retailer 11£2,813 GBP
Retailer 8£2,988 GBP
Retailer 6£3,130 GBP
Retailer 2£3,177 GBP
Retailer 3£3,298 GBP
Retailer 9£3,358 GBP
Retailer 7£3,428 GBP
Retailer 5£3,498 GBP
Retailer 4£3,665 GBP
Retailer 1£3,727 GBP
Retailer 12£4,226 GBP
Retailer 10£5,557 GBP

36 data points across 14 retailers

19 retailers£3,177 GBP to £3,727 GBP

Retailer 1
-
£2,767 GBP
Price last confirmed 7 days ago
Retailer 2
-
£2,809 GBP
View
Price last confirmed 8 days ago
Retailer 3
-
£2,813 GBP
View
Price last confirmed 9 days ago
Retailer 4
-
£2,988 GBP
View
Price last confirmed 8 days ago
Retailer 5
-
£3,130 GBP
View
Price last confirmed 7 days ago
B+
Retailer 6
-
£3,177 GBP
View
B
Retailer 7
-
£3,298 GBP
View
Retailer 8
-
£3,358 GBP
View
Price last confirmed 8 days ago
Retailer 9
-
£3,428 GBP
View
Price last confirmed 7 days ago
Retailer 10
-
£3,470 GBP
View
Price last confirmed 19 days ago
Retailer 11
-
£3,470 GBP
View
Price last confirmed 21 days ago
Retailer 12
-
£3,470 GBP
View
Price last confirmed 22 days ago
Retailer 13
-
£3,498 GBP
View
Price last confirmed 28 days ago
B
Retailer 14
-
£3,665 GBP
View
B
Retailer 15
-
£3,727 GBP
View
Retailer 16
-
£4,005 GBP
View
Price last confirmed 19 days ago
Retailer 17
-
£4,226 GBP
View
Price last confirmed 10 days ago
Retailer 18
-
£5,557 GBP
View
Price last confirmed 8 days ago
Most Expensive
NZ Jewellers
cc76e0f9-6f19-4815-a1d1-7f9994dc5d3b · Oct 17
£6,046 GBP
$8,093 USD
View
Price last confirmed 20 days ago
18 more retailers have this diamond
Prices start from £3,177 GBPSave up to £551 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
£3,177 GBP