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Heart|Natural|GIA

1.51ct K SI1 Heart Natural Diamond

EX • K/SI1 • GIA 6431871498

Certificate GIA 6431871498

Diamond specifications and retailer prices

From £1,616 GBP
As of November 6, 2026
Save £797 GBP (33%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £2,413 GBP at 77 Diamonds · As of November 6, 2026
View at 77 Diamonds

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 6431871498. Listed at 8 retailers as of November 6, 2026, with prices from £1,616 to £2,413, a £797 spread on the same certified stone. 77 Diamonds lists it at £2,413. 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
Crown angle39.09°
Pavilion angle39.18°
OriginNatural
Grading LabGIA
CertificateGIA 6431871498
Dimensions6.82 × 8.06 × 4.63 mm
L/W Ratio1.18
Top View
6.82 mm8.06 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6431871498
Side View
Table 61.0%Crown 39.09°Girdle: MED-VTKPavilion 39.18°Culet: NoneDepth 57.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £2,413 GBP|Low: £1,595 GBP|High: £2,440 GBP|Avg: £1,923 GBP|+1.4%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 5£1,616 GBP
Retailer 7£1,642 GBP
Retailer 8£1,650 GBP
Retailer 6£1,722 GBP
Retailer 9£1,965 GBP
Retailer 3£1,981 GBP
Retailer 4£1,990 GBP
Retailer 2£2,356 GBP
77 Diamonds£2,413 GBP

42 data points across 9 retailers

8 retailers£1,616 GBP to £2,413 GBP

A
Cheapest Retailer
-
£1,616 GBP
A
Retailer 2
-
£1,642 GBP
View
A
Retailer 3
-
£1,650 GBP
View
A
Retailer 4
-
£1,722 GBP
View
A
Retailer 5
-
£1,981 GBP
View
A
Retailer 6
-
£1,990 GBP
View
A
Retailer 7
-
£2,356 GBP
View
Most Expensive
A
77 Diamonds
HSMBVVDQGGSS · Nov 6
£2,413 GBP
View
7 more retailers have this diamond
Prices start from £1,616 GBPSave up to £797 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
£1,616 GBP