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Round|Natural|GIA

1.51ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 2146020726

Certificate GIA 2146020726

Diamond specifications and retailer prices

From $20,414 AUD
$14,340 USD
As of November 1, 2026
Save $13,899 AUD (41%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $40,703 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 2146020726. Listed at 21 retailers as of November 1, 2026, with a 68% 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
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2146020726
Dimensions7.39 × 7.35 × 4.51 mm
L/W Ratio1.01
Culet sizeNone
Top View
7.39 mm7.35 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2146020726
Side View
Table 60.0%CrownGirdle: Slightly ThickPavilionCulet: NoneDepth 61.1%

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: $36,476 AUD|Low: $19,463 AUD|High: $36,915 AUD|Avg: $26,708 AUD|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 6$20,414 AUD
Retailer 7$22,383 AUD
Retailer 3$24,111 AUD
Retailer 5$24,506 AUD
Retailer 8$24,913 AUD
Retailer 2$27,148 AUD
Retailer 4$34,314 AUD
Retailer 1$36,476 AUD

42 data points across 8 retailers

21 retailers$20,414 AUD to $34,314 AUD

B+
Cheapest Retailer
-
$20,414 AUD
$14,340 USD
B
Retailer 2
-
$21,385 AUD
$15,022 USD
View
B
Retailer 3
-
$21,471 AUD
$15,082 USD
View
B
Retailer 4
-
$21,898 AUD
CA$21,364 CAD
View
B
Retailer 5
-
$22,383 AUD
$15,723 USD
View
Final sale: no returns
B
Retailer 6
-
$22,870 AUD
$16,065 USD
View
B
Retailer 7
-
$23,356 AUD
$16,406 USD
View
B
Retailer 8
-
$24,111 AUD
£13,336 GBP
View
Retailer 9
-
$24,506 AUD
View
Price last confirmed 9 days ago
B
Retailer 10
-
$24,913 AUD
$17,500 USD
View
B
Retailer 11
-
$25,302 AUD
$17,773 USD
View
B
Retailer 12
-
$26,080 AUD
$18,320 USD
View
B
Retailer 13
-
$26,080 AUD
$18,320 USD
View
B
Retailer 14
-
$26,275 AUD
$18,457 USD
View
B
Retailer 15
-
$26,949 AUD
$18,930 USD
View
B
Retailer 16
-
$27,148 AUD
€18,162 EUR
View
B
Retailer 17
-
$27,155 AUD
$19,075 USD
View
B
Retailer 18
-
$33,087 AUD
$23,242 USD
View
B
Retailer 19
-
$34,314 AUD
ZAR 389,392 ZAR
View
Retailer 20
-
$36,476 AUD
£20,175 GBP
View
Price under review
Most Expensive
Diamond Quarter
1.51SI1D2126AC85N · Oct 29
$40,703 AUD
£22,513 GBP
View
Price under review
20 more retailers have this diamond
Prices start from $20,414 AUDSave up to $13,899 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
$20,414 AUD