Radiant|Natural|GIA

1.25ct K SI1 Radiant Natural Diamond

EX • K/SI1 • GIA 6551309782

Certificate GIA 6551309782

Diamond specifications and retailer prices

From €1,421 EUR
As of November 6, 2026
Save €1,840 EUR (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: €3,935 EUR 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

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: €1,576 EUR|Low: €1,386 EUR|High: €3,440 EUR|Avg: €2,001 EUR|-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€1,421 EUR
Retailer 12€1,574 EUR
Retailer 13€1,575 EUR
Retailer 1€1,576 EUR
Retailer 8€1,594 EUR
Retailer 11€1,656 EUR
Retailer 2€1,747 EUR
Retailer 5€1,818 EUR
Retailer 7€1,852 EUR
Retailer 3€2,063 EUR
Retailer 10€2,297 EUR
Retailer 9€2,531 EUR
Retailer 14€2,852 EUR
Retailer 6€3,261 EUR

37 data points across 14 retailers

16 retailers€1,421 EUR to €3,261 EUR

A
Cheapest Retailer
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€1,421 EUR
A
Retailer 2
-
€1,574 EUR
View
Final sale: no returns
A
Retailer 3
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€1,575 EUR
View
A
Retailer 4
-
€1,576 EUR
View
A
Retailer 5
-
€1,594 EUR
View
A
Retailer 6
-
€1,656 EUR
View
A
Retailer 7
-
€1,747 EUR
View
A
Retailer 8
-
€1,818 EUR
View
A
Retailer 9
-
€1,852 EUR
View
A
Retailer 10
-
€1,902 EUR
View
A
Retailer 11
-
€2,063 EUR
View
A
Retailer 12
-
€2,297 EUR
View
A
Retailer 13
-
€2,531 EUR
View
B+
Retailer 14
-
€2,852 EUR
View
B+
Retailer 15
-
€3,261 EUR
View
Most Expensive
NZ Jewellers
b4f77107-2584-40c9-9b49-88b7a2938865 · Sep 25
€3,935 EUR
$4,393 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from €1,421 EURSave up to €1,840 EUR

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
€1,421 EUR