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Round|Natural|GIA

1.51ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 2146020726

Certificate GIA 2146020726

Diamond specifications and retailer prices

From $18,332 SGD
$14,340 USD
As of November 1, 2026
Save $12,481 SGD (41%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $36,552 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 2146020726. Listed at 21 retailers as of November 1, 2026, with a 68% 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
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2146020726
Dimensions7.39 × 7.35 × 4.51 mm
L/W Ratio1.01
Culet sizeNone
Top View
7.39 mm7.35 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2146020726
Side View
Table 60.0%CrownGirdle: Slightly ThickPavilionCulet: NoneDepth 61.1%

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: $21,651 SGD|Low: $17,478 SGD|High: $33,150 SGD|Avg: $23,986 SGD|-0.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 6$18,332 SGD
Retailer 7$20,100 SGD
Retailer 1$21,651 SGD
Retailer 5$22,007 SGD
Retailer 8$22,372 SGD
Retailer 3$24,379 SGD
Retailer 4$30,814 SGD
Retailer 2$32,755 SGD

43 data points across 8 retailers

21 retailers$18,332 SGD to $30,814 SGD

B+
Cheapest Retailer
-
$18,332 SGD
$14,340 USD
B
Retailer 2
-
$19,204 SGD
$15,022 USD
View
B
Retailer 3
-
$19,281 SGD
$15,082 USD
View
B
Retailer 4
-
$19,664 SGD
CA$21,364 CAD
View
B
Retailer 5
-
$20,100 SGD
$15,723 USD
View
Final sale: no returns
B
Retailer 6
-
$20,537 SGD
$16,065 USD
View
B
Retailer 7
-
$20,973 SGD
$16,406 USD
View
B
Retailer 8
-
$21,651 SGD
£13,336 GBP
View
Retailer 9
-
$22,007 SGD
A$26,484 AUD
View
Price last confirmed 9 days ago
B
Retailer 10
-
$22,372 SGD
$17,500 USD
View
B
Retailer 11
-
$22,721 SGD
$17,773 USD
View
B
Retailer 12
-
$23,420 SGD
$18,320 USD
View
B
Retailer 13
-
$23,420 SGD
$18,320 USD
View
B
Retailer 14
-
$23,595 SGD
$18,457 USD
View
B
Retailer 15
-
$24,200 SGD
$18,930 USD
View
B
Retailer 16
-
$24,379 SGD
€18,162 EUR
View
B
Retailer 17
-
$24,385 SGD
$19,075 USD
View
B
Retailer 18
-
$29,713 SGD
$23,242 USD
View
B
Retailer 19
-
$30,814 SGD
ZAR 389,392 ZAR
View
Retailer 20
-
$32,755 SGD
£20,175 GBP
View
Price under review
Most Expensive
Diamond Quarter
1.51SI1D2126AC85N · Oct 29
$36,552 SGD
£22,513 GBP
View
Price under review
20 more retailers have this diamond
Prices start from $18,332 SGDSave up to $12,481 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
$18,332 SGD