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1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1563314290

Certificate GIA 1563314290

Diamond specifications and retailer prices

From £2,254 GBP
As of October 31, 2026
Save £2,034 GBP (47%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £4,288 GBP at Helzberg Diamonds · As of November 1, 2026
View at Helzberg Diamonds

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 1563314290. Listed at 15 retailers as of October 31, 2026, with prices from £2,254 to £4,288, a £2,034 spread on the same certified stone. Helzberg Diamonds lists it at £4,288. 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 angle33°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 1563314290
Dimensions6.85 × 6.89 × 4.20 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.85 mm6.89 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1563314290
Side View
Table 58.0%Crown 33°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 61.2%

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 31
Current: £4,288 GBP|Low: £2,254 GBP|High: £4,451 GBP|Avg: £3,047 GBP|-3.7%
Helzberg Diamonds
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
Retailer 15
Retailer 16
November 2, 2026
Retailer 12£2,254 GBP
Retailer 8£2,383 GBP
Retailer 14£2,400 GBP
Retailer 4£2,430 GBP
Retailer 11£2,458 GBP
Retailer 2£2,639 GBP
Retailer 3£2,712 GBP
Retailer 6£2,715 GBP
Retailer 13£2,885 GBP
Retailer 5£2,937 GBP
Retailer 9£3,001 GBP
Retailer 16£3,102 GBP
Retailer 10£3,127 GBP
Retailer 15£3,802 GBP
Retailer 7£4,124 GBP
Helzberg Diamonds£4,288 GBP

35 data points across 16 retailers

15 retailers£2,254 GBP to £4,288 GBP

A
Cheapest Retailer
-
£2,254 GBP
B+
Retailer 2
-
£2,400 GBP
View
B+
Retailer 3
-
£2,430 GBP
View
B+
Retailer 4
-
£2,458 GBP
View
B+
Retailer 5
-
£2,639 GBP
View
B+
Retailer 6
-
£2,712 GBP
View
B+
Retailer 7
-
£2,715 GBP
View
B+
Retailer 8
-
£2,885 GBP
View
B+
Retailer 9
-
£2,937 GBP
View
B+
Retailer 10
-
£3,001 GBP
View
B+
Retailer 11
-
£3,102 GBP
View
B+
Retailer 12
-
£3,127 GBP
View
B
Retailer 13
-
£3,802 GBP
View
Retailer 14
-
£4,124 GBP
View
Price last confirmed 16 days ago
Most Expensive
B
Helzberg Diamonds
XZRHLMJJHKIPG · Nov 1
£4,288 GBP
$5,739 USD
View
14 more retailers have this diamond
Prices start from £2,254 GBPSave up to £2,034 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
£2,254 GBP