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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 $16,021 SGD
$12,500 USD
As of October 25, 2026
Save $12,618 SGD (44%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $33,258 SGD 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: $19,062 SGD|Low: $16,016 SGD|High: $30,377 SGD|Avg: $20,895 SGD|-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$16,021 SGD
Retailer 2$16,676 SGD
Retailer 7$16,768 SGD
Retailer 16$17,072 SGD
Retailer 13$17,905 SGD
Retailer 8$18,418 SGD
Retailer 1$19,062 SGD
Retailer 12$19,600 SGD
Retailer 5$19,760 SGD
Retailer 3$20,674 SGD
Retailer 15$20,674 SGD
Retailer 4$21,171 SGD
Retailer 6$21,366 SGD
Retailer 10$22,041 SGD
Retailer 11$26,655 SGD
Retailer 9$28,639 SGD

41 data points across 16 retailers

22 retailers$16,021 SGD to $28,639 SGD

B+
Cheapest Retailer
-
$16,021 SGD
$12,500 USD
B
Retailer 2
-
$16,676 SGD
$13,011 USD
View
B
Retailer 3
-
$16,768 SGD
$13,083 USD
View
B
Retailer 4
-
$17,072 SGD
CA$18,500 CAD
View
B
Retailer 5
-
$17,205 SGD
A$20,652 AUD
View
B
Retailer 6
-
$17,905 SGD
$13,970 USD
View
B
Retailer 7
-
$18,240 SGD
$14,231 USD
View
B
Retailer 8
-
$18,418 SGD
$14,370 USD
View
Final sale: no returns
B
Retailer 9
-
$19,062 SGD
£11,711 GBP
View
B
Retailer 10
-
$19,456 SGD
$15,180 USD
View
B
Retailer 11
-
$19,600 SGD
A$23,527 AUD
View
B
Retailer 12
-
$19,760 SGD
$15,417 USD
View
B
Retailer 13
-
$20,520 SGD
$16,010 USD
View
B
Retailer 14
-
$20,674 SGD
$16,130 USD
View
B
Retailer 15
-
$20,674 SGD
$16,130 USD
View
B
Retailer 16
-
$21,171 SGD
$16,518 USD
View
B
Retailer 17
-
$21,366 SGD
$16,670 USD
View
B
Retailer 18
-
$22,041 SGD
€16,378 EUR
View
B
Retailer 19
-
$25,840 SGD
$20,161 USD
View
B
Retailer 20
-
$26,655 SGD
ZAR 335,971 ZAR
View
B
Retailer 21
-
$28,639 SGD
£17,594 GBP
View
Most Expensive
Diamond Quarter
1.51SI1E6485F425N · Oct 29
$33,258 SGD
£20,432 GBP
View
Price under review
21 more retailers have this diamond
Prices start from $16,021 SGDSave up to $12,618 SGD

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
$16,021 SGD