Radiant|Natural|GIA

1.25ct K SI1 Radiant Natural Diamond

EX • K/SI1 • GIA 6551309782

Certificate GIA 6551309782

Diamond specifications and retailer prices

From $1,587 USD
As of November 6, 2026
Save $2,054 USD (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $4,393 USD 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
Color
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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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $1,760 USD|Low: $1,548 USD|High: $3,841 USD|Avg: $2,234 USD|-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$1,587 USD
Retailer 12$1,757 USD
Retailer 13$1,759 USD
Retailer 1$1,760 USD
Retailer 8$1,780 USD
Retailer 11$1,849 USD
Retailer 2$1,950 USD
Retailer 5$2,030 USD
Retailer 7$2,068 USD
Retailer 3$2,303 USD
Retailer 10$2,565 USD
Retailer 9$2,826 USD
Retailer 14$3,184 USD
Retailer 6$3,641 USD

37 data points across 14 retailers

16 retailers$1,587 USD to $3,641 USD

A
Cheapest Retailer
-
$1,587 USD
A
Retailer 2
-
$1,757 USD
View
Final sale: no returns
A
Retailer 3
-
$1,759 USD
View
A
Retailer 4
-
$1,760 USD
View
A
Retailer 5
-
$1,780 USD
View
A
Retailer 6
-
$1,849 USD
View
A
Retailer 7
-
$1,950 USD
View
A
Retailer 8
-
$2,030 USD
View
A
Retailer 9
-
$2,068 USD
View
A
Retailer 10
-
$2,124 USD
View
A
Retailer 11
-
$2,303 USD
View
A
Retailer 12
-
$2,565 USD
View
A
Retailer 13
-
$2,826 USD
View
B+
Retailer 14
-
$3,184 USD
View
B+
Retailer 15
-
$3,641 USD
View
Most Expensive
NZ Jewellers
b4f77107-2584-40c9-9b49-88b7a2938865 · Sep 25
$4,393 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from $1,587 USDSave up to $2,054 USD

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
$1,587 USD