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Heart|Natural|GIA

1.21ct F SI1 Heart Natural Diamond

EX • F/SI1 • GIA 1553316223

Certificate GIA 1553316223

Diamond specifications and retailer prices

From £1,636 GBP
As of November 6, 2026
Save £315 GBP (16%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £1,951 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1553316223. Listed at 6 retailers as of November 5, 2026, with prices from £1,636 to £1,951, a £315 spread on the same certified stone. Blue Nile lists it at £1,951. 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
F
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1553316223
Dimensions6.68 × 7.29 × 4.34 mm
L/W Ratio1.09
Culet sizeNone
Key to symbols
Twinning Wisp, Feather, Indented Natural, Natural
Top View
6.68 mm7.29 mm1.21 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1553316223
Side View
Table 58.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 59.6%

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: £1,951 GBP|Low: £1,567 GBP|High: £2,375 GBP|Avg: £1,860 GBP|-17.9%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 4£1,636 GBP
Retailer 3£1,644 GBP
Retailer 6£1,663 GBP
Retailer 2£1,744 GBP
Retailer 5£1,878 GBP
Blue Nile£1,951 GBP

42 data points across 6 retailers

6 retailers£1,636 GBP to £1,951 GBP

A
Cheapest Retailer
-
£1,636 GBP
A
Retailer 2
-
£1,644 GBP
View
Final sale: no returns
A
Retailer 3
-
£1,663 GBP
View
A
Retailer 4
-
£1,744 GBP
View
B+
Retailer 5
-
£1,878 GBP
View
Most Expensive
B+
Blue Nile
29182291 · Nov 5
£1,951 GBP
$2,611 USD
View
5 more retailers have this diamond
Prices start from £1,636 GBPSave up to £315 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
£1,636 GBP