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Heart|Natural|GIA

1.21ct J SI1 Heart Natural Diamond

GD • J/SI1 • GIA 7458197631

Certificate GIA 7458197631

Diamond specifications and retailer prices

From £1,558 GBP
As of November 6, 2026
Save £1,456 GBP (48%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,014 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 7458197631. Listed at 12 retailers as of November 4, 2026, with prices from £1,558 to £3,014, a £1,456 spread on the same certified stone. MOH London lists it at £3,014. 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
J
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 7458197631
Dimensions6.47 × 5.84 × 3.91 mm
L/W Ratio1.11
Top View
6.47 mm5.84 mm1.21 ctJ / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 7458197631
Side View
Table 65.0%CrownGirdle: ThickPavilionCulet: NoneDepth 67.0%

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 6
Current: £3,014 GBP|Low: £1,298 GBP|High: £3,059 GBP|Avg: £1,966 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7£1,558 GBP
Retailer 2£1,577 GBP
Retailer 9£1,673 GBP
Retailer 6£1,726 GBP
Retailer 5£1,729 GBP
Retailer 4£2,105 GBP
Retailer 3£2,122 GBP
Retailer 8£2,132 GBP
MOH London£3,014 GBP

37 data points across 9 retailers

12 retailers£1,558 GBP to £3,014 GBP

B+
Cheapest Retailer
-
£1,558 GBP
B+
Retailer 2
-
£1,577 GBP
View
Final sale: no returns
B
Retailer 3
-
£1,673 GBP
View
B
Retailer 4
-
£1,726 GBP
View
B
Retailer 5
-
£1,729 GBP
View
B
Retailer 6
-
£1,740 GBP
View
B
Retailer 7
-
£1,829 GBP
View
B
Retailer 8
-
£1,892 GBP
View
B
Retailer 9
-
£2,105 GBP
View
B
Retailer 10
-
£2,122 GBP
View
Retailer 11
-
£2,132 GBP
View
Price last confirmed 34 days ago
Most Expensive
C
MOH London
CA0DCDDA5 · Nov 4
£3,014 GBP
View
11 more retailers have this diamond
Prices start from £1,558 GBPSave up to £1,456 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
£1,558 GBP