CaratHunter
Plans
Round|Natural|GIA

1.21ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2507471981

Certificate GIA 2507471981

Diamond specifications and retailer prices

From £2,132 GBP
As of November 6, 2026
Save £3,701 GBP (63%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: £5,833 GBP at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

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 2507471981. Listed at 24 retailers as of November 5, 2026, with prices from £2,132 to £5,833, a £3,701 spread on the same certified stone. Diamond Quarter lists it at £5,833. 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 angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2507471981
Dimensions6.77 × 6.74 × 4.23 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
6.77 mm6.74 mm1.21 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2507471981
Side View
Table 59.0%Crown 36°Girdle: THN-STKPavilion 41°Culet: NoneDepth 62.6%

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: £2,727 GBP|Low: £2,132 GBP|High: £4,966 GBP|Avg: £3,396 GBP|-1.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 10£2,132 GBP
Retailer 11£2,631 GBP
Retailer 4£2,683 GBP
Retailer 1£2,727 GBP
Retailer 5£2,852 GBP
Retailer 2£3,053 GBP
Retailer 8£3,278 GBP
Retailer 6£3,311 GBP
Retailer 7£3,479 GBP
Retailer 9£4,767 GBP
Retailer 3£4,966 GBP

36 data points across 11 retailers

24 retailers£2,132 GBP to £5,833 GBP

A
Cheapest Retailer
-
£2,132 GBP
B+
Retailer 2
-
£2,530 GBP
View
B+
Retailer 3
-
£2,572 GBP
View
B+
Retailer 4
-
£2,631 GBP
View
Final sale: no returns
B+
Retailer 5
-
£2,683 GBP
View
B+
Retailer 6
-
£2,699 GBP
View
Retailer 7
-
£2,704 GBP
View
Price last confirmed 117 days ago
B+
Retailer 8
-
£2,727 GBP
View
B+
Retailer 9
-
£2,727 GBP
View
Retailer 10
-
£2,850 GBP
View
Price last confirmed 39 days ago
B
Retailer 11
-
£2,850 GBP
View
Retailer 12
-
£2,850 GBP
View
Price last confirmed 12 days ago
B+
Retailer 13
-
£2,852 GBP
View
B+
Retailer 14
-
£2,959 GBP
View
B+
Retailer 15
-
£2,960 GBP
View
Retailer 16
-
£3,053 GBP
View
Price last confirmed 29 days ago
B+
Retailer 17
-
£3,278 GBP
View
Retailer 18
-
£3,289 GBP
View
Price last confirmed 39 days ago
B+
Retailer 19
-
£3,311 GBP
View
B
Retailer 20
-
£3,479 GBP
View
B
Retailer 21
-
£4,767 GBP
View
Retailer 22
-
£4,966 GBP
View
Price last confirmed 41 days ago
B
Retailer 23
-
£4,966 GBP
View
Most Expensive
B
Diamond Quarter
1.21SI1H25811F54N · Nov 5
£5,833 GBP
View
23 more retailers have this diamond
Prices start from £2,132 GBPSave up to £3,701 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
£2,132 GBP