CaratHunter
Plans
Heart|Natural|GIA

1.21ct D SI1 Heart Natural Diamond

EX • D/SI1 • GIA 6157010233

Certificate GIA 6157010233

Diamond specifications and retailer prices

From £2,935 GBP
As of November 6, 2026
Save £3,609 GBP (55%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £6,543 GBP at NZ Jewellers · As of November 5, 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 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 6157010233. Listed at 9 retailers as of November 5, 2026, with prices from £2,935 to £6,543, a £3,609 spread on the same certified stone. NZ Jewellers lists it at £6,543. 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
PolishVery Good
SymmetryGood
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6157010233
Dimensions7.33 × 7.70 × 3.58 mm
L/W Ratio1.05
Top View
7.33 mm7.70 mm1.21 ctD / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryGood
FluorescenceNone
CertificateGIA 6157010233
Side View
Table 58.0%CrownGirdle: MED-EXTPavilionCulet: NoneDepth 46.5%

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: £6,543 GBP|Low: £2,935 GBP|High: £6,543 GBP|Avg: £4,334 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 5£2,935 GBP
Retailer 6£3,402 GBP
Retailer 7£3,402 GBP
Retailer 3£3,734 GBP
Retailer 8£3,926 GBP
Retailer 2£4,226 GBP
Retailer 4£5,982 GBP
NZ Jewellers£6,543 GBP

44 data points across 8 retailers

9 retailers£2,935 GBP to £6,543 GBP

B+
Cheapest Retailer
-
£2,935 GBP
B
Retailer 2
-
£3,402 GBP
View
B
Retailer 3
-
£3,402 GBP
View
B
Retailer 4
-
£3,734 GBP
View
B
Retailer 5
-
£3,926 GBP
View
B
Retailer 6
-
£4,226 GBP
View
B
Retailer 7
-
£5,490 GBP
View
B
Retailer 8
-
£5,982 GBP
View
Most Expensive
B
NZ Jewellers
4d776d7f-8c59-4e0a-82a6-bbebfabea9df · Nov 5
£6,543 GBP
$8,758 USD
View
8 more retailers have this diamond
Prices start from £2,935 GBPSave up to £3,609 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
£2,935 GBP