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1.51ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 6422149049

Certificate GIA 6422149049

Diamond specifications and retailer prices

From $18,037 AUD
$12,670 USD
As of November 1, 2026
Save $14,067 AUD (44%) vs most expensive(unlock to see where)
22 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 6422149049. Listed at 22 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
SymmetryExcellent
FluorescenceNone
Crown angle32°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 6422149049
Dimensions7.51 × 7.45 × 4.51 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
7.51 mm7.45 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6422149049
Side View
Table 59.0%Crown 32°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 60.4%

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: $21,487 AUD|Low: $17,130 AUD|High: $32,491 AUD|Avg: $23,725 AUD|-0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 6$18,037 AUD
Retailer 7$19,700 AUD
Retailer 1$21,487 AUD
Retailer 8$21,926 AUD
Retailer 5$22,085 AUD
Retailer 3$24,774 AUD
Retailer 4$30,201 AUD
Retailer 2$32,104 AUD

43 data points across 8 retailers

22 retailers$18,037 AUD to $32,104 AUD

B+
Cheapest Retailer
-
$18,037 AUD
$12,670 USD
B
Retailer 2
-
$18,797 AUD
$13,204 USD
View
B
Retailer 3
-
$18,898 AUD
$13,275 USD
View
B
Retailer 4
-
$19,243 AUD
CA$18,774 CAD
View
B
Retailer 5
-
$19,700 AUD
$13,838 USD
View
Final sale: no returns
B
Retailer 6
-
$20,172 AUD
$14,170 USD
View
B
Retailer 7
-
$20,557 AUD
$14,440 USD
View
B
Retailer 8
-
$21,487 AUD
£11,884 GBP
View
B
Retailer 9
-
$21,926 AUD
$15,402 USD
View
Retailer 10
-
$22,085 AUD
View
Price last confirmed 9 days ago
B
Retailer 11
-
$22,269 AUD
$15,643 USD
View
B
Retailer 12
-
$23,126 AUD
$16,245 USD
View
B
Retailer 13
-
$23,262 AUD
$16,340 USD
View
B
Retailer 14
-
$23,262 AUD
$16,340 USD
View
B
Retailer 15
-
$23,864 AUD
$16,763 USD
View
B
Retailer 16
-
$24,045 AUD
$16,890 USD
View
B
Retailer 17
-
$24,062 AUD
$16,902 USD
View
B
Retailer 18
-
$24,774 AUD
€16,574 EUR
View
B
Retailer 19
-
$29,121 AUD
$20,456 USD
View
B
Retailer 20
-
$30,201 AUD
ZAR 342,717 ZAR
View
B
Retailer 21
-
$32,104 AUD
£17,757 GBP
View
Most Expensive
Diamond Quarter
1.51SI1D644955AFN · Oct 29
$36,232 AUD
£20,040 GBP
View
Price under review
21 more retailers have this diamond
Prices start from $18,037 AUDSave up to $14,067 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
$18,037 AUD