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Round|Natural|GIA

1.51ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 1139615477

Certificate GIA 1139615477

Diamond specifications and retailer prices

From $18,414 AUD
$12,935 USD
As of November 1, 2026
Save $14,419 AUD (44%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $36,232 AUD at Diamond Quarter · As of October 29, 2026
View at Diamond Quarter

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1139615477. Listed at 21 retailers as of November 1, 2026, with a 78% 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

1.51
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1139615477
Dimensions7.34 × 7.32 × 4.54 mm
L/W Ratio1.00
Culet sizeNone
Top View
7.34 mm7.32 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1139615477
Side View
Table 57.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 61.9%

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 1
Current: $21,979 AUD|Low: $17,519 AUD|High: $33,229 AUD|Avg: $24,257 AUD|-0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 6$18,414 AUD
Retailer 7$20,147 AUD
Retailer 1$21,979 AUD
Retailer 5$22,086 AUD
Retailer 8$22,425 AUD
Retailer 3$25,344 AUD
Retailer 4$30,886 AUD
Retailer 2$32,833 AUD

43 data points across 8 retailers

21 retailers$18,414 AUD to $32,833 AUD

B+
Cheapest Retailer
-
$18,414 AUD
$12,935 USD
B
Retailer 2
-
$19,229 AUD
$13,507 USD
View
B
Retailer 3
-
$19,327 AUD
$13,576 USD
View
B
Retailer 4
-
$19,687 AUD
CA$19,207 CAD
View
B
Retailer 5
-
$20,147 AUD
$14,152 USD
View
Final sale: no returns
B
Retailer 6
-
$20,621 AUD
$14,485 USD
View
B
Retailer 7
-
$21,022 AUD
$14,767 USD
View
B
Retailer 8
-
$21,979 AUD
£12,156 GBP
View
Retailer 9
-
$22,086 AUD
View
Price last confirmed 9 days ago
B
Retailer 10
-
$22,425 AUD
$15,752 USD
View
B
Retailer 11
-
$22,775 AUD
$15,998 USD
View
B
Retailer 12
-
$23,650 AUD
$16,613 USD
View
B
Retailer 13
-
$23,746 AUD
$16,680 USD
View
B
Retailer 14
-
$23,746 AUD
$16,680 USD
View
B
Retailer 15
-
$24,412 AUD
$17,148 USD
View
B
Retailer 16
-
$24,529 AUD
$17,230 USD
View
B
Retailer 17
-
$25,344 AUD
€16,955 EUR
View
B
Retailer 18
-
$29,783 AUD
$20,921 USD
View
B
Retailer 19
-
$30,886 AUD
ZAR 350,496 ZAR
View
B
Retailer 20
-
$32,833 AUD
£18,160 GBP
View
Most Expensive
Diamond Quarter
1.51SI1D11776546N · Oct 29
$36,232 AUD
£20,040 GBP
View
Price under review
20 more retailers have this diamond
Prices start from $18,414 AUDSave up to $14,419 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+
1.51ct Round
$18,414 AUD