CaratHunter
Plans
Heart|Natural|GIA

1.31ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 6531769899

Certificate GIA 6531769899

Diamond specifications and retailer prices

From £1,706 GBP
As of November 6, 2026
Save £2,282 GBP (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £4,691 GBP at NZ Jewellers · As of September 25, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6531769899. Listed at 20 retailers as of November 5, 2026, with a 134% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.31
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.07°
Pavilion angle38.95°
OriginNatural
Grading LabGIA
CertificateGIA 6531769899
Dimensions6.66 × 7.59 × 4.49 mm
L/W Ratio1.14
Top View
6.66 mm7.59 mm1.31 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6531769899
Side View
Table 60.0%Crown 39.07°Girdle: MED-THKPavilion 38.95°Culet: NoneDepth 59.1%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: £3,988 GBP|Low: £1,706 GBP|High: £4,691 GBP|Avg: £2,480 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 6, 2026
Retailer 2£1,706 GBP
Retailer 5£1,954 GBP
Retailer 15£2,050 GBP
Retailer 14£2,112 GBP
Retailer 13£2,226 GBP
Retailer 7£2,244 GBP
Retailer 16£2,289 GBP
Retailer 9£2,366 GBP
Retailer 4£2,377 GBP
Retailer 12£2,395 GBP
Retailer 8£2,397 GBP
Retailer 3£2,576 GBP
Retailer 6£2,641 GBP
Retailer 10£2,794 GBP
Retailer 11£3,818 GBP
NZ Jewellers£3,988 GBP

33 data points across 16 retailers

20 retailers£1,706 GBP to £3,988 GBP

A
Cheapest Retailer
-
£1,706 GBP
A
Retailer 2
-
£1,954 GBP
View
A
Retailer 3
-
£2,050 GBP
View
A
Retailer 4
-
£2,078 GBP
View
A
Retailer 5
-
£2,112 GBP
View
Final sale: no returns
B+
Retailer 6
-
£2,226 GBP
View
Retailer 7
-
£2,244 GBP
View
Price last confirmed 46 days ago
Retailer 8
-
£2,244 GBP
View
Price last confirmed 9 days ago
A
Retailer 9
-
£2,289 GBP
View
B+
Retailer 10
-
£2,366 GBP
View
B+
Retailer 11
-
£2,377 GBP
View
B+
Retailer 12
-
£2,395 GBP
View
Retailer 13
-
£2,397 GBP
View
Price last confirmed 31 days ago
B+
Retailer 14
-
£2,576 GBP
View
Retailer 15
-
£2,589 GBP
View
Price last confirmed 44 days ago
B+
Retailer 16
-
£2,641 GBP
View
B+
Retailer 17
-
£2,794 GBP
View
B
Retailer 18
-
£3,818 GBP
View
B
Retailer 19
-
£3,988 GBP
View
Most Expensive
NZ Jewellers
95c02344-1a40-4209-bdc5-fe4540743353 · Sep 25
£4,691 GBP
$6,279 USD
View
Price last confirmed 42 days ago
19 more retailers have this diamond
Prices start from £1,706 GBPSave up to £2,282 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
£1,706 GBP