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Heart|Natural|GIA

1.51ct K SI1 Heart Natural Diamond

EX • K/SI1 • GIA 1538771191

Certificate GIA 1538771191

Diamond specifications and retailer prices

From $2,377 USD
As of November 6, 2026
Save $469 USD (16%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $2,846 USD at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.51ct natural heart diamond

This 1.51ct natural heart sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1538771191. Listed at 6 retailers as of November 5, 2026, with prices from $2,377 to $2,846, a $469 spread on the same certified stone. Blue Nile lists it at $2,846. 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
K
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1538771191
Dimensions6.89 × 8.10 × 4.80 mm
L/W Ratio1.18
Culet sizeNone
Key to symbols
Twinning Wisp, Crystal, Feather, Cloud, Indented Natural
Top View
6.89 mm8.10 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1538771191
Side View
Table 58.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 59.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $2,846 USD|Low: $2,377 USD|High: $3,532 USD|Avg: $2,770 USD|-19.4%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 4$2,377 USD
Retailer 6$2,438 USD
Retailer 3$2,554 USD
Retailer 2$2,557 USD
Retailer 5$2,762 USD
Blue Nile$2,846 USD

45 data points across 6 retailers

6 retailers$2,377 USD to $2,846 USD

A
Cheapest Retailer
-
$2,377 USD
A
Retailer 2
-
$2,438 USD
View
A
Retailer 3
-
$2,554 USD
View
A
Retailer 4
-
$2,557 USD
View
A
Retailer 5
-
$2,762 USD
View
Most Expensive
A
Blue Nile
27029150 · Nov 5
$2,846 USD
View
5 more retailers have this diamond
Prices start from $2,377 USDSave up to $469 USD

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.

A
1.51ct Heart
$2,377 USD