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Heart|Natural|GIA

1.21ct K SI1 Heart Natural Diamond

GD • K/SI1 • GIA 1146870344

Certificate GIA 1146870344

Diamond specifications and retailer prices

From £1,282 GBP
As of November 5, 2026
Save £1,432 GBP (53%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £2,714 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.21ct natural heart diamond

This 1.21ct natural heart sits in the classic one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 1146870344. Listed at 7 retailers as of November 4, 2026, with prices from £1,282 to £2,714, a £1,432 spread on the same certified stone. MOH London lists it at £2,714. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
K
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryGood
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1146870344
Dimensions6.05 × 8.74 × 4.04 mm
L/W Ratio1.44
Top View
6.05 mm8.74 mm1.21 ctK / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryGood
FluorescenceMedium
CertificateGIA 1146870344
Side View
Table 67.0%CrownGirdle: UND-VTKPavilionCulet: NoneDepth 46.2%

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: £2,714 GBP|Low: £1,282 GBP|High: £2,754 GBP|Avg: £1,792 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 4£1,282 GBP
Retailer 3£1,407 GBP
Retailer 6£1,410 GBP
Retailer 5£1,529 GBP
Retailer 2£1,687 GBP
Retailer 8£2,015 GBP
Retailer 7£2,195 GBP
MOH London£2,714 GBP

37 data points across 8 retailers

7 retailers£1,282 GBP to £2,714 GBP

B+
Cheapest Retailer
-
£1,282 GBP
Retailer 2
-
£1,407 GBP
View
Price last confirmed 8 days ago
B+
Retailer 3
-
£1,410 GBP
View
B
Retailer 4
-
£1,529 GBP
View
B
Retailer 5
-
£1,687 GBP
View
C
Retailer 6
-
£2,195 GBP
View
Most Expensive
C
MOH London
A268D12B1 · Nov 4
£2,714 GBP
View
6 more retailers have this diamond
Prices start from £1,282 GBPSave up to £1,432 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 Heart
£1,282 GBP