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Round|Natural|GIA

1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6405215785

Certificate GIA 6405215785

Diamond specifications and retailer prices

From $17,793 AUD
$12,500 USD
As of October 25, 2026
Save $14,012 AUD (44%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $36,935 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6405215785. Listed at 22 retailers as of October 25, 2026, with a 79% 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
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6405215785
Dimensions7.44 × 7.41 × 4.45 mm
L/W Ratio1.00
Top View
7.44 mm7.41 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6405215785
Side View
Table 61.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 59.9%

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: Oct 25
Current: $21,170 AUD|Low: $17,787 AUD|High: $33,736 AUD|Avg: $23,205 AUD|-5.9%
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
October 29, 2026
Retailer 14$17,793 AUD
Retailer 2$18,520 AUD
Retailer 7$18,622 AUD
Retailer 16$18,959 AUD
Retailer 13$19,885 AUD
Retailer 8$20,454 AUD
Retailer 1$21,170 AUD
Retailer 12$21,767 AUD
Retailer 5$21,945 AUD
Retailer 3$22,959 AUD
Retailer 15$22,959 AUD
Retailer 4$23,512 AUD
Retailer 6$23,728 AUD
Retailer 10$24,478 AUD
Retailer 11$29,602 AUD
Retailer 9$31,805 AUD

41 data points across 16 retailers

22 retailers$17,793 AUD to $31,805 AUD

B+
Cheapest Retailer
-
$17,793 AUD
$12,500 USD
B
Retailer 2
-
$18,520 AUD
$13,011 USD
View
B
Retailer 3
-
$18,622 AUD
$13,083 USD
View
B
Retailer 4
-
$18,959 AUD
CA$18,500 CAD
View
B
Retailer 5
-
$19,108 AUD
View
B
Retailer 6
-
$19,885 AUD
$13,970 USD
View
B
Retailer 7
-
$20,256 AUD
$14,231 USD
View
B
Retailer 8
-
$20,454 AUD
$14,370 USD
View
Final sale: no returns
B
Retailer 9
-
$21,170 AUD
£11,711 GBP
View
B
Retailer 10
-
$21,607 AUD
$15,180 USD
View
B
Retailer 11
-
$21,767 AUD
View
B
Retailer 12
-
$21,945 AUD
$15,417 USD
View
B
Retailer 13
-
$22,789 AUD
$16,010 USD
View
B
Retailer 14
-
$22,959 AUD
$16,130 USD
View
B
Retailer 15
-
$22,959 AUD
$16,130 USD
View
B
Retailer 16
-
$23,512 AUD
$16,518 USD
View
B
Retailer 17
-
$23,728 AUD
$16,670 USD
View
B
Retailer 18
-
$24,478 AUD
€16,378 EUR
View
B
Retailer 19
-
$28,697 AUD
$20,161 USD
View
B
Retailer 20
-
$29,602 AUD
ZAR 335,971 ZAR
View
B
Retailer 21
-
$31,805 AUD
£17,594 GBP
View
Most Expensive
Diamond Quarter
1.51SI1E6485F425N · Oct 29
$36,935 AUD
£20,432 GBP
View
Price under review
21 more retailers have this diamond
Prices start from $17,793 AUDSave up to $14,012 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
$17,793 AUD