Radiant|Natural|GIA

1.51ct I SI1 Radiant Natural Diamond

EX • I/SI1 • GIA 6183608449

Certificate GIA 6183608449

Diamond specifications and retailer prices

From $3,909 USD
As of November 2, 2026
Save $4,322 USD (53%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $8,231 USD at MOH London · As of October 29, 2026
View at MOH London

About this 1.51ct natural radiant diamond

This 1.51ct natural radiant sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6183608449. Listed at 16 retailers as of October 29, 2026, with prices from $3,909 to $8,231, a $4,322 spread on the same certified stone. MOH London lists it at $8,231. 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

1.51
Carat
I
Color
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6183608449
Dimensions7.34 × 5.85 × 4.09 mm
L/W Ratio1.25
Culet sizeNone
Top View
7.34 mm5.85 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6183608449
Side View
Table 65.0%CrownGirdle: Slightly ThickPavilionCulet: NoneDepth 69.9%

Caratlytics Score

How it works →
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 2
Current: $8,231 USD|Low: $3,858 USD|High: $8,287 USD|Avg: $5,041 USD|+0.4%
MOH London
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
Retailer 15
November 2, 2026
Retailer 15$3,909 USD
Retailer 9$3,990 USD
Retailer 3$4,016 USD
Retailer 4$4,110 USD
Retailer 6$4,398 USD
Retailer 5$4,904 USD
Retailer 14$4,916 USD
Retailer 8$5,132 USD
Retailer 11$5,182 USD
Retailer 10$5,230 USD
Retailer 13$5,230 USD
Retailer 12$5,400 USD
Retailer 2$5,485 USD
Retailer 7$5,674 USD
MOH London$8,231 USD

43 data points across 15 retailers

16 retailers$3,909 USD to $8,231 USD

A
Cheapest Retailer
-
$3,909 USD
Retailer 2
-
$3,990 USD
View
Price last confirmed 12 days ago
A
Retailer 3
-
$4,016 USD
View
A
Retailer 4
-
$4,110 USD
View
A
Retailer 5
-
$4,246 USD
A$6,533 AUD
View
A
Retailer 6
-
$4,398 USD
CA$6,108 CAD
View
A
Retailer 7
-
$4,904 USD
View
A
Retailer 8
-
$4,916 USD
View
A
Retailer 9
-
$5,132 USD
£4,041 GBP
View
Retailer 10
-
$5,182 USD
A$7,973 AUD
View
Price last confirmed 23 days ago
B+
Retailer 11
-
$5,230 USD
View
B+
Retailer 12
-
$5,230 USD
View
B+
Retailer 13
-
$5,400 USD
View
B+
Retailer 14
-
$5,485 USD
€5,224 EUR
View
Retailer 15
-
$5,674 USD
View
Price last confirmed 10 days ago
Most Expensive
B
MOH London
308625714 · Oct 29
$8,231 USD
£6,481 GBP
View
15 more retailers have this diamond
Prices start from $3,909 USDSave up to $4,322 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
1.51ct Radiant
$3,909 USD