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Round|Natural|GIA

1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6405890761

Certificate GIA 6405890761

Diamond specifications and retailer prices

From $17,495 CAD
$12,500 USD
As of October 25, 2026
Save $13,778 CAD (44%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $36,317 CAD 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 6405890761. 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
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6405890761
Dimensions7.42 × 7.39 × 4.49 mm
L/W Ratio1.00
Top View
7.42 mm7.39 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6405890761
Side View
Table 59.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 60.6%

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: $20,816 CAD|Low: $17,489 CAD|High: $33,172 CAD|Avg: $22,907 CAD|-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$17,495 CAD
Retailer 2$18,210 CAD
Retailer 7$18,311 CAD
Retailer 16$18,642 CAD
Retailer 13$19,552 CAD
Retailer 8$20,112 CAD
Retailer 1$20,816 CAD
Retailer 12$21,403 CAD
Retailer 5$21,578 CAD
Retailer 3$22,576 CAD
Retailer 15$22,576 CAD
Retailer 4$23,119 CAD
Retailer 6$23,331 CAD
Retailer 10$23,975 CAD
Retailer 11$29,107 CAD
Retailer 9$31,273 CAD

43 data points across 16 retailers

22 retailers$17,495 CAD to $31,273 CAD

B+
Cheapest Retailer
-
$17,495 CAD
$12,500 USD
B
Retailer 2
-
$18,210 CAD
$13,011 USD
View
B
Retailer 3
-
$18,311 CAD
$13,083 USD
View
B
Retailer 4
-
$18,642 CAD
View
B
Retailer 5
-
$18,788 CAD
A$20,652 AUD
View
B
Retailer 6
-
$19,552 CAD
$13,970 USD
View
B
Retailer 7
-
$19,918 CAD
$14,231 USD
View
B
Retailer 8
-
$20,112 CAD
$14,370 USD
View
Final sale: no returns
B
Retailer 9
-
$20,816 CAD
£11,711 GBP
View
B
Retailer 10
-
$21,246 CAD
$15,180 USD
View
B
Retailer 11
-
$21,403 CAD
A$23,527 AUD
View
B
Retailer 12
-
$21,578 CAD
$15,417 USD
View
B
Retailer 13
-
$22,408 CAD
$16,010 USD
View
B
Retailer 14
-
$22,576 CAD
$16,130 USD
View
B
Retailer 15
-
$22,576 CAD
$16,130 USD
View
B
Retailer 16
-
$23,119 CAD
$16,518 USD
View
B
Retailer 17
-
$23,331 CAD
$16,670 USD
View
B
Retailer 18
-
$23,975 CAD
€16,314 EUR
View
B
Retailer 19
-
$28,217 CAD
$20,161 USD
View
B
Retailer 20
-
$29,107 CAD
ZAR 335,971 ZAR
View
B
Retailer 21
-
$31,273 CAD
£17,594 GBP
View
Most Expensive
B
Diamond Quarter
1.51SI1E646109B5N · Oct 29
$36,317 CAD
£20,432 GBP
View
Price under review
21 more retailers have this diamond
Prices start from $17,495 CADSave up to $13,778 CAD

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
$17,495 CAD