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Heart|Natural|GIA

1.21ct D SI1 Heart Natural Diamond

EX • D/SI1 • GIA 2145498543

Certificate GIA 2145498543

Diamond specifications and retailer prices

From £2,994 GBP
As of November 6, 2026
Save £3,014 GBP (50%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £6,008 GBP at MOH London · As of November 7, 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 D 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 2145498543. Listed at 15 retailers as of November 6, 2026, with prices from £2,994 to £6,008, a £3,014 spread on the same certified stone. MOH London lists it at £6,008. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryGood
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2145498543
Dimensions6.59 × 5.54 × 3.75 mm
L/W Ratio1.19
Culet sizeNone
Top View
6.59 mm5.54 mm1.21 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryGood
FluorescenceNone
CertificateGIA 2145498543
Side View
Table 68.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 67.6%

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: £6,008 GBP|Low: £2,921 GBP|High: £6,403 GBP|Avg: £3,922 GBP|-1.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 7, 2026
Retailer 7£2,994 GBP
Retailer 4£2,997 GBP
Retailer 5£3,019 GBP
Retailer 14£3,059 GBP
Retailer 13£3,246 GBP
Retailer 16£3,436 GBP
Retailer 10£3,744 GBP
Retailer 8£3,909 GBP
Retailer 15£3,925 GBP
Retailer 9£4,036 GBP
Retailer 6£4,187 GBP
Retailer 11£4,266 GBP
Retailer 12£4,627 GBP
Retailer 2£4,752 GBP
Retailer 3£5,489 GBP
MOH London£6,008 GBP

28 data points across 16 retailers

15 retailers£2,994 GBP to £6,008 GBP

B+
Cheapest Retailer
-
£2,994 GBP
B+
Retailer 2
-
£2,997 GBP
View
B+
Retailer 3
-
£3,019 GBP
View
Final sale: no returns
Retailer 4
-
£3,059 GBP
View
Price last confirmed 10 days ago
B
Retailer 5
-
£3,246 GBP
View
B
Retailer 6
-
£3,436 GBP
View
B
Retailer 7
-
£3,744 GBP
View
B
Retailer 8
-
£3,925 GBP
View
B
Retailer 9
-
£4,036 GBP
View
Retailer 10
-
£4,187 GBP
View
Price last confirmed 15 days ago
B
Retailer 11
-
£4,266 GBP
View
B
Retailer 12
-
£4,627 GBP
View
B
Retailer 13
-
£4,752 GBP
View
B
Retailer 14
-
£5,489 GBP
View
Most Expensive
B
MOH London
D254C7E99 · Nov 7
£6,008 GBP
View
14 more retailers have this diamond
Prices start from £2,994 GBPSave up to £3,014 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
£2,994 GBP