CaratHunter
Plans
Heart|Natural|GIA

1.21ct H SI2 Heart Natural Diamond

ID • H/SI2 • GIA 1558163586

Certificate GIA 1558163586

Diamond specifications and retailer prices

From £1,499 GBP
$2,008 USD
As of November 1, 2026
Save £1,861 GBP (55%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,970 GBP at NZ Jewellers · As of October 21, 2026
View at NZ Jewellers

About this 1.21ct natural heart diamond

This 1.21ct natural heart sits in the classic one-carat band, graded H 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 1558163586. Listed at 14 retailers as of November 1, 2026, with a 124% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
H
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1558163586
Dimensions6.55 × 7.18 × 4.32 mm
L/W Ratio1.10
Culet sizeNone
Key to symbols
Twinning Wisp, Needle, Indented Natural
Top View
6.55 mm7.18 mm1.21 ctH / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558163586
Side View
Table 58.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 60.1%

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 1
Current: £3,970 GBP|Low: £1,323 GBP|High: £3,970 GBP|Avg: £2,242 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 5£1,514 GBP
Retailer 9£1,588 GBP
Retailer 7£1,720 GBP
Retailer 8£1,799 GBP
Retailer 2£1,895 GBP
Retailer 6£1,984 GBP
Retailer 3£2,393 GBP
Retailer 4£3,359 GBP
NZ Jewellers£3,970 GBP

41 data points across 9 retailers

14 retailers£1,499 GBP to £3,359 GBP

A
Cheapest Retailer
-
£1,499 GBP
$2,008 USD
A
Retailer 2
-
£1,514 GBP
$2,028 USD
View
A
Retailer 3
-
£1,588 GBP
$2,128 USD
View
Final sale: no returns
Retailer 4
-
£1,720 GBP
$2,305 USD
View
Price last confirmed 11 days ago
Retailer 5
-
£1,799 GBP
$2,411 USD
View
Price last confirmed 10 days ago
B+
Retailer 6
-
£1,821 GBP
$2,440 USD
View
B+
Retailer 7
-
£1,895 GBP
View
Retailer 8
-
£1,984 GBP
$2,659 USD
View
Price last confirmed 10 days ago
B+
Retailer 9
-
£2,000 GBP
$2,680 USD
View
B+
Retailer 10
-
£2,000 GBP
$2,680 USD
View
B+
Retailer 11
-
£2,067 GBP
$2,770 USD
View
B+
Retailer 12
-
£2,393 GBP
€3,054 EUR
View
B
Retailer 13
-
£3,359 GBP
View
Most Expensive
NZ Jewellers
947fbdde-43a0-4ecc-abb4-39f7641ae374 · Oct 21
£3,970 GBP
$5,319 USD
View
Price last confirmed 12 days ago
13 more retailers have this diamond
Prices start from £1,499 GBPSave up to £1,861 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
£1,499 GBP