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Heart|Natural|GIA

1.23ct D SI2 Heart Natural Diamond

EX • D/SI2 • GIA 2126575943

Certificate GIA 2126575943

Diamond specifications and retailer prices

From £5,097 GBP
As of November 4, 2026
Save £1,802 GBP (26%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £8,826 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.23ct natural heart diamond

This 1.23ct natural heart sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2126575943. Listed at 6 retailers as of November 4, 2026, with a 35% 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

1.23
Carat
D
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2126575943
Dimensions7.03 × 5.79 × 3.62 mm
L/W Ratio1.21
Top View
7.03 mm5.79 mm1.23 ctD / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2126575943
Side View
Table 67.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 62.5%

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 4
Current: £8,826 GBP|Low: £6,268 GBP|High: £8,956 GBP|Avg: £7,242 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 3£6,320 GBP
Retailer 5£6,486 GBP
Retailer 2£6,899 GBP
Retailer 4£7,569 GBP
MOH London£8,826 GBP

41 data points across 5 retailers

6 retailers£5,097 GBP to £6,899 GBP

B
Cheapest Retailer
-
£5,097 GBP
B
Retailer 2
-
£5,488 GBP
View
B
Retailer 3
-
£6,320 GBP
View
B
Retailer 4
-
£6,486 GBP
View
B
Retailer 5
-
£6,899 GBP
View
Most Expensive
MOH London
C5384A221 · Nov 4
£8,826 GBP
View
Price under review
5 more retailers have this diamond
Prices start from £5,097 GBPSave up to £1,802 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
£5,097 GBP