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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 £1,776 GBP
As of November 6, 2026
Save £350 GBP (16%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £2,126 GBP 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 £1,776 to £2,126, a £350 spread on the same certified stone. Blue Nile lists it at £2,126. 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
Colour
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: £2,126 GBP|Low: £1,776 GBP|High: £2,639 GBP|Avg: £2,069 GBP|-19.4%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 4£1,776 GBP
Retailer 6£1,821 GBP
Retailer 3£1,908 GBP
Retailer 2£1,910 GBP
Retailer 5£2,064 GBP
Blue Nile£2,126 GBP

45 data points across 6 retailers

6 retailers£1,776 GBP to £2,126 GBP

A
Cheapest Retailer
-
£1,776 GBP
A
Retailer 2
-
£1,821 GBP
View
A
Retailer 3
-
£1,908 GBP
View
A
Retailer 4
-
£1,910 GBP
View
A
Retailer 5
-
£2,064 GBP
View
Most Expensive
A
Blue Nile
27029150 · Nov 5
£2,126 GBP
$2,846 USD
View
5 more retailers have this diamond
Prices start from £1,776 GBPSave up to £350 GBP

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
£1,776 GBP