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Heart|Natural|GIA

1.23ct D SI1 Heart Natural Diamond

VG • D/SI1 • GIA 6421591328

Certificate GIA 6421591328

Diamond specifications and retailer prices

From £2,917 GBP
As of November 6, 2026
Save £3,465 GBP (54%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £6,382 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.23ct natural heart diamond

This 1.23ct natural heart sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6421591328. Listed at 13 retailers as of November 5, 2026, with prices from £2,917 to £6,382, a £3,465 spread on the same certified stone. NZ Jewellers lists it at £6,382. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.23
Carat
D
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6421591328
Dimensions7.28 × 6.27 × 3.74 mm
L/W Ratio1.16
Top View
7.28 mm6.27 mm1.23 ctD / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6421591328
Side View
Table 59.0%CrownGirdle: Very ThickPavilionCulet: NoneDepth 59.6%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £6,382 GBP|Low: £2,651 GBP|High: £6,382 GBP|Avg: £4,174 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 8£2,917 GBP
Retailer 2£3,639 GBP
Retailer 9£3,663 GBP
Retailer 10£3,663 GBP
Retailer 11£3,663 GBP
Retailer 6£3,665 GBP
Retailer 7£3,692 GBP
Retailer 3£4,226 GBP
Retailer 4£4,469 GBP
Retailer 5£5,678 GBP
NZ Jewellers£6,382 GBP

44 data points across 11 retailers

13 retailers£2,917 GBP to £6,382 GBP

B
Cheapest Retailer
-
£2,917 GBP
Final sale: no returns
B
Retailer 2
-
£3,639 GBP
View
Retailer 3
-
£3,663 GBP
View
Price last confirmed 8 days ago
B
Retailer 4
-
£3,663 GBP
View
B
Retailer 5
-
£3,663 GBP
View
B
Retailer 6
-
£3,665 GBP
View
Retailer 7
-
£3,692 GBP
View
Price last confirmed 28 days ago
B
Retailer 8
-
£3,713 GBP
View
B
Retailer 9
-
£3,776 GBP
View
B
Retailer 10
-
£4,226 GBP
View
B
Retailer 11
-
£4,469 GBP
View
B
Retailer 12
-
£5,678 GBP
View
Most Expensive
B
NZ Jewellers
8df258f0-f6e5-44b8-aada-89b0f87417ad · Nov 5
£6,382 GBP
$8,542 USD
View
12 more retailers have this diamond
Prices start from £2,917 GBPSave up to £3,465 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
1.23ct Heart
£2,917 GBP