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Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

EX • I/SI1

Diamond specifications and retailer prices

From $12,798 NZD
$7,184 USD
As of October 29, 2026
Save $440 NZD (3%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $13,238 NZD at Blue Nile · As of October 29, 2026
View at Blue Nile

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 3 retailers as of October 29, 2026, with a relatively tight 3% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
Dimensions7.27 × 7.30 × 4.56 mm
L/W Ratio1.00
Top View
7.27 mm7.30 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA
Side View
Table 57.0%CrownGirdle: MED - STKPavilionCulet: NoneDepth 62.5%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 29
Current: $13,238 NZD|Low: $10,792 NZD|High: $13,238 NZD|Avg: $12,123 NZD
Blue Nile
Retailer 2
Retailer 3
Retailer 4
October 29, 2026
Retailer 4$10,792 NZD
Retailer 3$12,798 NZD
Retailer 2$12,996 NZD
Blue Nile$13,238 NZD

2 data points across 4 retailers

3 retailers$12,798 NZD to $13,238 NZD

B
Cheapest Retailer
-
$12,798 NZD
$7,184 USD
B
Retailer 2
-
$12,996 NZD
$7,295 USD
View
Most Expensive
B
Blue Nile
27926173 · Oct 29
$13,238 NZD
$7,431 USD
View
2 more retailers have this diamond
Prices start from $12,798 NZDSave up to $440 NZD

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
$12,798 NZD