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Heart|Natural|GIA

1.21ct I SI2 Heart Natural Diamond

ID • I/SI2 • GIA 64

Certificate GIA 64

Diamond specifications and retailer prices

From £2,916 GBP
As of November 6, 2026
Save £763 GBP (21%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £3,679 GBP at Blue Nile · As of November 5, 2026
View at Blue Nile

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. Listed at 3 retailers as of November 5, 2026, with prices from £2,916 to £3,679, a £763 spread on the same certified stone. Blue Nile lists it at £3,679. 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
PolishVery Good
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 64
Dimensions6.48 × 7.52 × 4.38 mm
L/W Ratio1.16
Top View
6.48 mm7.52 mm1.21 ctI / SI2
OriginNatural
CutIdeal
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 64
Side View
Table 61.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 58.2%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 6
Current: £3,679 GBP|Low: £2,916 GBP|High: £3,679 GBP|Avg: £3,132 GBP
Blue Nile
Retailer 2
Retailer 3
September 26, 2026
Retailer 2£2,916 GBP
Retailer 3£3,075 GBP
Blue Nile£3,679 GBP

2 data points across 3 retailers

3 retailers£2,916 GBP to £3,679 GBP

B
Cheapest Retailer
-
£2,916 GBP
B
Retailer 2
-
£3,075 GBP
View
Most Expensive
B
Blue Nile
14940417 · Nov 5
£3,679 GBP
$4,924 USD
View
2 more retailers have this diamond
Prices start from £2,916 GBPSave up to £763 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
£2,916 GBP