CaratHunter
Plans
Radiant|Natural|GIA

1.31ct K SI1 Radiant Natural Diamond

ID • K/SI1 • GIA 11

Certificate GIA 11

Diamond specifications and retailer prices

From £1,813 GBP
As of November 4, 2026
Save £2,306 GBP (56%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £4,120 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.31ct natural radiant diamond

This 1.31ct natural radiant 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 top-tier cut grade stated by the retailer rather than the lab and certified by GIA. Listed at 8 retailers as of November 4, 2026, with prices from £1,813 to £4,120, a £2,306 spread on the same certified stone. NZ Jewellers lists it at £4,120. 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
K
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 11
Dimensions7.33 × 5.49 × 3.75 mm
L/W Ratio1.34
Top View
7.33 mm5.49 mm1.31 ctK / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 11
Side View
Table 68.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 68.3%

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 4
Current: £4,120 GBP|Low: £1,813 GBP|High: £4,120 GBP|Avg: £2,406 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
September 30, 2026
Retailer 8£1,813 GBP
Retailer 4£1,866 GBP
Retailer 5£2,142 GBP
Retailer 6£2,142 GBP
Retailer 2£2,225 GBP
Retailer 3£2,315 GBP
Retailer 7£2,471 GBP
NZ Jewellers£4,120 GBP

3 data points across 8 retailers

8 retailers£1,813 GBP to £4,120 GBP

A
Cheapest Retailer
-
£1,813 GBP
A
Retailer 2
-
£1,866 GBP
View
Retailer 3
-
£2,142 GBP
View
Price last confirmed 9 days ago
A
Retailer 4
-
£2,142 GBP
View
A
Retailer 5
-
£2,225 GBP
View
B+
Retailer 6
-
£2,315 GBP
View
B+
Retailer 7
-
£2,471 GBP
View
Most Expensive
B
NZ Jewellers
cb41615b-a6f8-4181-bfe7-05febe830fb7 · Nov 5
£4,120 GBP
$5,514 USD
View
7 more retailers have this diamond
Prices start from £1,813 GBPSave up to £2,306 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 Radiant
£1,813 GBP