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Round|Natural|GIA

1.51ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 1139615477

Certificate GIA 1139615477

Diamond specifications and retailer prices

From $16,536 SGD
$12,935 USD
As of November 1, 2026
Save $12,948 SGD (44%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $32,537 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1139615477. Listed at 21 retailers as of November 1, 2026, with a 78% 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1139615477
Dimensions7.34 × 7.32 × 4.54 mm
L/W Ratio1.00
Culet sizeNone
Top View
7.34 mm7.32 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1139615477
Side View
Table 57.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 61.9%

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: Nov 1
Current: $19,737 SGD|Low: $15,732 SGD|High: $29,840 SGD|Avg: $21,783 SGD|-0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 6$16,536 SGD
Retailer 7$18,092 SGD
Retailer 1$19,737 SGD
Retailer 5$19,833 SGD
Retailer 8$20,137 SGD
Retailer 3$22,759 SGD
Retailer 4$27,736 SGD
Retailer 2$29,484 SGD

43 data points across 8 retailers

21 retailers$16,536 SGD to $29,484 SGD

B+
Cheapest Retailer
-
$16,536 SGD
$12,935 USD
B
Retailer 2
-
$17,267 SGD
$13,507 USD
View
B
Retailer 3
-
$17,356 SGD
$13,576 USD
View
B
Retailer 4
-
$17,679 SGD
CA$19,207 CAD
View
B
Retailer 5
-
$18,092 SGD
$14,152 USD
View
Final sale: no returns
B
Retailer 6
-
$18,518 SGD
$14,485 USD
View
B
Retailer 7
-
$18,878 SGD
$14,767 USD
View
B
Retailer 8
-
$19,737 SGD
£12,156 GBP
View
Retailer 9
-
$19,833 SGD
A$23,868 AUD
View
Price last confirmed 9 days ago
B
Retailer 10
-
$20,137 SGD
$15,752 USD
View
B
Retailer 11
-
$20,452 SGD
$15,998 USD
View
B
Retailer 12
-
$21,238 SGD
$16,613 USD
View
B
Retailer 13
-
$21,324 SGD
$16,680 USD
View
B
Retailer 14
-
$21,324 SGD
$16,680 USD
View
B
Retailer 15
-
$21,922 SGD
$17,148 USD
View
B
Retailer 16
-
$22,027 SGD
$17,230 USD
View
B
Retailer 17
-
$22,759 SGD
€16,955 EUR
View
B
Retailer 18
-
$26,745 SGD
$20,921 USD
View
B
Retailer 19
-
$27,736 SGD
ZAR 350,496 ZAR
View
B
Retailer 20
-
$29,484 SGD
£18,160 GBP
View
Most Expensive
Diamond Quarter
1.51SI1D11776546N · Oct 29
$32,537 SGD
£20,040 GBP
View
Price under review
20 more retailers have this diamond
Prices start from $16,536 SGDSave up to $12,948 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
$16,536 SGD