CaratHunter
Plans
Radiant|Natural|GIA

1.25ct K SI1 Radiant Natural Diamond

EX • K/SI1 • GIA 6551309782

Certificate GIA 6551309782

Diamond specifications and retailer prices

From £1,186 GBP
As of November 6, 2026
Save £1,535 GBP (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £3,282 GBP at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.25ct natural radiant diamond

This 1.25ct 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 6551309782. Listed at 16 retailers as of November 1, 2026, with a 129% 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

1.25
Carat
K
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551309782
Dimensions7.21 × 5.33 × 3.60 mm
L/W Ratio1.35
Girdle conditionPolished
Top View
7.21 mm5.33 mm1.25 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551309782
Side View
Table 67.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 67.5%

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: £1,315 GBP|Low: £1,157 GBP|High: £2,870 GBP|Avg: £1,669 GBP|-13.1%
Retailer 1
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
November 7, 2026
Retailer 4£1,186 GBP
Retailer 12£1,313 GBP
Retailer 13£1,314 GBP
Retailer 1£1,315 GBP
Retailer 8£1,330 GBP
Retailer 11£1,381 GBP
Retailer 2£1,457 GBP
Retailer 5£1,517 GBP
Retailer 7£1,545 GBP
Retailer 3£1,721 GBP
Retailer 10£1,916 GBP
Retailer 9£2,111 GBP
Retailer 14£2,379 GBP
Retailer 6£2,720 GBP

37 data points across 14 retailers

16 retailers£1,186 GBP to £2,720 GBP

A
Cheapest Retailer
-
£1,186 GBP
A
Retailer 2
-
£1,313 GBP
View
Final sale: no returns
A
Retailer 3
-
£1,314 GBP
View
A
Retailer 4
-
£1,315 GBP
View
A
Retailer 5
-
£1,330 GBP
View
A
Retailer 6
-
£1,381 GBP
View
A
Retailer 7
-
£1,457 GBP
View
A
Retailer 8
-
£1,517 GBP
View
A
Retailer 9
-
£1,545 GBP
View
A
Retailer 10
-
£1,587 GBP
View
A
Retailer 11
-
£1,721 GBP
View
A
Retailer 12
-
£1,916 GBP
View
A
Retailer 13
-
£2,111 GBP
View
B+
Retailer 14
-
£2,379 GBP
View
B+
Retailer 15
-
£2,720 GBP
View
Most Expensive
NZ Jewellers
b4f77107-2584-40c9-9b49-88b7a2938865 · Sep 25
£3,282 GBP
$4,393 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from £1,186 GBPSave up to £1,535 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
1.25ct Radiant
£1,186 GBP