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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 $9,929 AUD
As of November 4, 2026
Save $3,510 AUD (26%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $17,193 AUD 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: $17,193 AUD|Low: $12,209 AUD|High: $17,447 AUD|Avg: $14,108 AUD|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 3$12,311 AUD
Retailer 5$12,634 AUD
Retailer 2$13,439 AUD
Retailer 4$14,745 AUD
MOH London$17,193 AUD

41 data points across 5 retailers

6 retailers$9,929 AUD to $13,439 AUD

B
Cheapest Retailer
-
$9,929 AUD
B
Retailer 2
-
$10,691 AUD
View
B
Retailer 3
-
$12,311 AUD
View
B
Retailer 4
-
$12,634 AUD
View
B
Retailer 5
-
$13,439 AUD
View
Most Expensive
MOH London
C5384A221 · Nov 4
$17,193 AUD
£9,302 GBP
View
Price under review
5 more retailers have this diamond
Prices start from $9,929 AUDSave up to $3,510 AUD

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
$9,929 AUD