Round|Natural|GIA

1.51ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 3415658160

Certificate GIA 3415658160

Diamond specifications and retailer prices

From $10,976 AUD

$7,710 USD

As of October 31, 2026

Save $18,102 AUD (62%) vs most expensive(unlock to see where)

27 retailers carry this diamond

Most expensive: $29,078 AUD at Diamond Quarter · As of October 31, 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 3415658160. Listed at 27 retailers as of October 31, 2026, with prices from $10,976 to $29,078, a $18,102 spread on the same certified stone. Diamond Quarter lists it at $29,078. 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

Colour

SI1

Clarity

Excellent

Cut

Specifications

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle33.5°

Pavilion angle41.4°

OriginNatural

Grading LabGIA

CertificateGIA 3415658160

Dimensions7.34 × 7.30 × 4.59 mm

L/W Ratio1.01

View GIA Report →View Loupe360 Video →

Top View

OriginNatural

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateGIA 3415658160

Side View

Caratlytics Score

How it works →

Excellent

Excellent quality and great value

Unlock full score analysis

See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31

Current: $18,989 AUD|Low: $10,976 AUD|High: $22,168 AUD|Avg: $15,331 AUD|-13.4%

Retailer 1

Retailer 2

Retailer 3

Retailer 4

Retailer 5

Retailer 6

Retailer 7

Retailer 8

Retailer 9

Retailer 10

Retailer 11

Retailer 12

Retailer 13

Retailer 14

Retailer 15

Retailer 16

Retailer 17

Retailer 18

Retailer 19

Retailer 20

Retailer 21

November 1, 2026

Retailer 6$10,976 AUD

Retailer 8$11,034 AUD

Retailer 4$11,383 AUD

Retailer 20$11,577 AUD

Retailer 9$11,722 AUD

Retailer 18$12,079 AUD

Retailer 7$12,158 AUD

Retailer 5$12,960 AUD

Retailer 12$13,195 AUD

Retailer 17$13,507 AUD

Retailer 21$13,607 AUD

Retailer 2$14,108 AUD

Retailer 10$14,108 AUD

Retailer 3$14,578 AUD

Retailer 19$14,751 AUD

Retailer 16$15,157 AUD

Retailer 13$15,428 AUD

Retailer 11$15,586 AUD

Retailer 14$17,530 AUD

Retailer 15$17,861 AUD

Retailer 1$18,989 AUD

41 data points across 21 retailers

27 retailers$10,976 AUD to $29,078 AUD

Cheapest Retailer

$10,976 AUD

$7,710 USD

Retailer 2

$11,034 AUD

$7,751 USD

View

Retailer 3

$11,383 AUD

$7,996 USD

View

Retailer 4

$11,577 AUD

$8,132 USD

View

Retailer 5

$11,722 AUD

$8,234 USD

View

Retailer 6

$12,079 AUD

$8,485 USD

View

B+

Retailer 7

$12,158 AUD

$8,540 USD

View

Final sale: no returns

B+

Retailer 8

$12,960 AUD

$9,104 USD

View

B+

Retailer 9

$13,195 AUD

£7,299 GBP

View

B+

Retailer 10

$13,507 AUD

$9,488 USD

View

B+

Retailer 11

$13,607 AUD

$9,558 USD

View

Retailer 12

$14,024 AUD

$9,851 USD

View

Price last confirmed 17 days ago

B+

Retailer 13

$14,108 AUD

$9,910 USD

View

B+

Retailer 14

$14,108 AUD

$9,910 USD

View

B+

Retailer 15

$14,578 AUD

$10,240 USD

View

B+

Retailer 16

$14,751 AUD

$10,362 USD

View

B+

Retailer 17

$15,157 AUD

€10,140 EUR

View

Retailer 18

$15,193 AUD

$10,672 USD

View

Price last confirmed 10 days ago

Retailer 19

$15,428 AUD

$10,837 USD

View

Price last confirmed 10 days ago

Retailer 20

$15,586 AUD

View

Price last confirmed 29 days ago

Retailer 21

$15,625 AUD

$10,976 USD

View

Price last confirmed 18 days ago

Retailer 22

$17,530 AUD

$12,314 USD

View

Price last confirmed 12 days ago

B+

Retailer 23

$17,861 AUD

ZAR 202,693 ZAR

View

Retailer 24

$18,989 AUD

£10,503 GBP

View

Retailer 25

$23,374 AUD

$16,419 USD

View

Price last confirmed 12 days ago

Retailer 26

$27,739 AUD

£15,343 GBP

View

Most Expensive

Diamond Quarter

1.51SI1D34607BA3N · Oct 31

$29,078 AUD

£16,083 GBP

View

26 more retailers have this diamond

Prices start from $10,976 AUDSave up to $18,102 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.

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1.51ct Round

$10,976 AUD