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Heart|Natural|GIA

1.21ct I SI2 Heart Natural Diamond

ID • I/SI2 • GIA 1548178088

Certificate GIA 1548178088

Diamond specifications and retailer prices

From £1,408 GBP
As of November 6, 2026
Save £1,170 GBP (45%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £2,578 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1548178088. Listed at 5 retailers as of November 4, 2026, with prices from £1,408 to £2,578, a £1,170 spread on the same certified stone. MOH London lists it at £2,578. 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
I
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.67°
OriginNatural
Grading LabGIA
CertificateGIA 1548178088
Dimensions7.43 × 6.43 × 4.34 mm
L/W Ratio1.16
Cert comments
Additional clouds are not shown. Pinpoints are not shown.
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
7.43 mm6.43 mm1.21 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1548178088
Side View
Table 58.0%Crown 35.67°Girdle: MED-THKPavilionCulet: NoneDepth 58.4%

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: £2,578 GBP|Low: £1,408 GBP|High: £2,955 GBP|Avg: £1,851 GBP|-9.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 4£1,408 GBP
Retailer 2£1,602 GBP
Retailer 3£1,614 GBP
Retailer 6£1,670 GBP
Retailer 5£1,711 GBP
MOH London£2,578 GBP

42 data points across 6 retailers

5 retailers£1,408 GBP to £2,578 GBP

A
Cheapest Retailer
-
£1,408 GBP
A
Retailer 2
-
£1,602 GBP
View
A
Retailer 3
-
£1,614 GBP
View
Retailer 4
-
£1,711 GBP
View
Price last confirmed 39 days ago
Most Expensive
B
MOH London
3E85B4E35 · Nov 4
£2,578 GBP
View
4 more retailers have this diamond
Prices start from £1,408 GBPSave up to £1,170 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 Heart
£1,408 GBP