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Heart|Natural|IGI

1.31ct K SI1 Heart Natural Diamond

VG • K/SI1 • IGI 788607896

Shape and cutting style on the report: Heart brilliant

Certificate IGI 788607896

Diamond specifications and retailer prices

From £1,142 GBP
As of November 6, 2026
Save £1,088 GBP (49%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £3,199 GBP at NZ Jewellers · As of September 30, 2026
View at NZ Jewellers

About this 1.31ct natural heart diamond

This 1.31ct natural heart sits in the one-and-a-quarter to one-and-a-half carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 788607896. Listed at 15 retailers as of November 2, 2026, with a 95% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.31
Carat
K
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle39.3°
OriginNatural
Grading LabIGI
CertificateIGI 788607896
Dimensions6.89 × 7.58 × 4.31 mm
L/W Ratio1.10
Girdle conditionFaceted
Culet sizePointed
Top View
6.89 mm7.58 mm1.31 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 788607896
Side View
Table 60.0%Crown 35.4°Girdle: STK-THKPavilion 39.3°Culet: NoneDepth 56.9%

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: £1,142 GBP|Low: £1,142 GBP|High: £2,325 GBP|Avg: £1,540 GBP|-1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 1£1,142 GBP
Retailer 9£1,296 GBP
Retailer 2£1,312 GBP
Retailer 7£1,326 GBP
Retailer 10£1,333 GBP
Retailer 4£1,356 GBP
Retailer 6£1,436 GBP
Retailer 5£1,553 GBP
Retailer 3£1,703 GBP
Retailer 8£2,230 GBP

44 data points across 10 retailers

15 retailers£1,142 GBP to £2,230 GBP

A
Cheapest Retailer
-
£1,142 GBP
B+
Retailer 2
-
£1,296 GBP
View
Retailer 3
-
£1,312 GBP
View
Price last confirmed 36 days ago
Retailer 4
-
£1,312 GBP
View
Price last confirmed 21 days ago
B+
Retailer 5
-
£1,326 GBP
View
B+
Retailer 6
-
£1,333 GBP
View
B+
Retailer 7
-
£1,356 GBP
View
Retailer 8
-
£1,372 GBP
View
Price last confirmed 36 days ago
B+
Retailer 9
-
£1,436 GBP
View
Retailer 10
-
£1,514 GBP
View
Price last confirmed 61 days ago
Retailer 11
-
£1,514 GBP
View
Price last confirmed 38 days ago
B+
Retailer 12
-
£1,553 GBP
View
B+
Retailer 13
-
£1,703 GBP
View
B+
Retailer 14
-
£2,230 GBP
View
Most Expensive
NZ Jewellers
cb930f5a-9955-4523-ba58-6f6fcdb7c4c6 · Sep 30
£3,199 GBP
$4,282 USD
View
Price last confirmed 37 days ago
14 more retailers have this diamond
Prices start from £1,142 GBPSave up to £1,088 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
1.31ct Heart
£1,142 GBP