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Radiant|Natural|GIA

1.30ct K SI1 Radiant Natural Diamond

ID • K/SI1 • GIA 4

Certificate GIA 4

Diamond specifications and retailer prices

From £2,590 GBP
As of November 4, 2026
Save £651 GBP (20%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £3,242 GBP at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.3ct natural radiant diamond

This 1.3ct 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 3 retailers as of November 4, 2026, with prices from £2,590 to £3,242, a £651 spread on the same certified stone. Blue Nile lists it at £3,242. 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

1.30
Carat
K
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 4
Dimensions7.07 × 5.85 × 3.79 mm
L/W Ratio1.21
Top View
7.07 mm5.85 mm1.30 ctK / SI1
OriginNatural
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 4
Side View
Table 70.0%CrownGirdle: MED-ETKPavilionCulet: NoneDepth 64.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 4
Current: £3,242 GBP|Low: £2,590 GBP|High: £3,242 GBP|Avg: £2,721 GBP
Blue Nile
Retailer 2
Retailer 3
September 26, 2026
Retailer 3£2,590 GBP
Retailer 2£2,591 GBP
Blue Nile£3,242 GBP

2 data points across 3 retailers

3 retailers£2,590 GBP to £3,242 GBP

B+
Cheapest Retailer
-
£2,590 GBP
B+
Retailer 2
-
£2,591 GBP
View
Most Expensive
B
Blue Nile
5631297 · Nov 5
£3,242 GBP
$4,339 USD
View
2 more retailers have this diamond
Prices start from £2,590 GBPSave up to £651 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.

B+
1.30ct Radiant
£2,590 GBP