Round|Natural|GIA

1.50ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 6505156143

Certificate GIA 6505156143

Diamond specifications and retailer prices

From $12,699 AUD

$8,920 USD

As of October 25, 2026

Save $13,458 AUD (51%) vs most expensive(unlock to see where)

33 retailers carry this diamond

Most expensive: $26,156 AUD at Diamond Quarter · As of October 31, 2026

View at Diamond Quarter

About this 1.5ct natural round diamond

This 1.5ct 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 6505156143. Listed at 33 retailers as of October 25, 2026, with prices from $12,699 to $26,156, a $13,458 spread on the same certified stone. Diamond Quarter lists it at $26,156. 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

1.50

Carat

Colour

SI1

Clarity

Excellent

Cut

Specifications

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle32°

Pavilion angle41°

OriginNatural

Grading LabGIA

CertificateGIA 6505156143

Dimensions7.42 × 7.38 × 4.43 mm

L/W Ratio1.01

Star length50%

Lower girdle80%

View GIA Report →View Loupe360 Video →

Top View

OriginNatural

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateGIA 6505156143

Side View

Caratlytics Score

How it works →

Excellent

Excellent quality and great value

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

Price History

Last verified: Oct 25

Current: $15,435 AUD|Low: $11,557 AUD|High: $24,188 AUD|Avg: $16,588 AUD|-3.2%

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

October 31, 2026

Retailer 20$12,699 AUD

Retailer 4$13,010 AUD

Retailer 18$13,868 AUD

Retailer 7$14,311 AUD

Retailer 2$14,512 AUD

Retailer 8$14,512 AUD

Retailer 1$15,435 AUD

Retailer 9$15,510 AUD

Retailer 11$15,722 AUD

Retailer 21$15,964 AUD

Retailer 17$15,985 AUD

Retailer 10$16,109 AUD

Retailer 5$16,179 AUD

Retailer 12$16,748 AUD

Retailer 13$17,300 AUD

Retailer 14$17,670 AUD

Retailer 15$18,087 AUD

Retailer 6$18,141 AUD

Retailer 19$20,908 AUD

Retailer 16$22,786 AUD

Retailer 3$24,188 AUD

32 data points across 21 retailers

33 retailers$12,699 AUD to $26,156 AUD

Cheapest Retailer

$12,699 AUD

$8,920 USD

B+

Retailer 2

$13,010 AUD

$9,139 USD

View

B+

Retailer 3

$13,211 AUD

$9,280 USD

View

B+

Retailer 4

$13,466 AUD

$9,459 USD

View

B+

Retailer 5

$13,833 AUD

$9,717 USD

View

B+

Retailer 6

$13,868 AUD

$9,742 USD

View

B+

Retailer 7

$14,311 AUD

CA$13,962 CAD

View

B+

Retailer 8

$14,350 AUD

$10,080 USD

View

B+

Retailer 9

$14,512 AUD

$10,194 USD

View

Final sale: no returns

B+

Retailer 10

$14,512 AUD

$10,194 USD

View

B+

Retailer 11

$15,435 AUD

£8,537 GBP

View

B+

Retailer 12

$15,480 AUD

$10,874 USD

View

B+

Retailer 13

$15,510 AUD

$10,895 USD

View

B+

Retailer 14

$15,722 AUD

$11,044 USD

View

B+

Retailer 15

$15,964 AUD

$11,214 USD

View

Retailer 16

$15,985 AUD

View

Price last confirmed 8 days ago

B+

Retailer 17

$16,109 AUD

$11,316 USD

View

B+

Retailer 18

$16,110 AUD

$11,316 USD

View

B+

Retailer 19

$16,179 AUD

$11,365 USD

View

Retailer 20

$16,216 AUD

$11,391 USD

View

Price last confirmed 9 days ago

B+

Retailer 21

$16,748 AUD

£9,264 GBP

View

Retailer 22

$16,998 AUD

$11,940 USD

View

Retailer 23

$16,998 AUD

$11,940 USD

View

Retailer 24

$17,297 AUD

$12,150 USD

View

Retailer 25

$17,300 AUD

$12,152 USD

View

Retailer 26

$17,553 AUD

$12,330 USD

View

Retailer 27

$17,670 AUD

$12,412 USD

View

Retailer 28

$18,087 AUD

€12,100 EUR

View

Retailer 29

$18,141 AUD

$12,743 USD

View

Retailer 30

$20,908 AUD

ZAR 237,269 ZAR

View

Price last confirmed 9 days ago

Retailer 31

$22,786 AUD

£12,603 GBP

View

Retailer 32

$24,188 AUD

$16,991 USD

View

Most Expensive

Diamond Quarter

1.5SI1D65439546KG · Oct 31

$26,156 AUD

£14,467 GBP

View

32 more retailers have this diamond

Prices start from $12,699 AUDSave up to $13,458 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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