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Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566054289

Certificate GIA 2566054289

Diamond specifications and retailer prices

From €4,925 EUR
$5,502 USD
As of November 1, 2026
Save €4,012 EUR (45%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: €10,363 EUR at NZ Jewellers · As of September 28, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round 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 and certified by GIA 2566054289. Listed at 19 retailers as of November 1, 2026, with a 81% 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

1.51
Carat
I
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2566054289
Dimensions7.28 × 7.32 × 4.59 mm
L/W Ratio1.01
Star length50%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Knot, Feather, Needle
Top View
7.28 mm7.32 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566054289
Side View
Table 56.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.8%

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 1
Current: €6,819 EUR|Low: €4,925 EUR|High: €9,240 EUR|Avg: €6,342 EUR|+12.6%
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
Retailer 15
November 1, 2026
Retailer 2€4,925 EUR
Retailer 5€5,066 EUR
Retailer 13€5,072 EUR
Retailer 3€5,135 EUR
Retailer 6€5,362 EUR
Retailer 15€5,397 EUR
Retailer 4€5,721 EUR
Retailer 7€5,917 EUR
Retailer 12€5,917 EUR
Retailer 10€6,109 EUR
Retailer 14€6,224 EUR
Retailer 8€6,596 EUR
Retailer 1€6,819 EUR
Retailer 11€7,879 EUR
Retailer 9€8,937 EUR

39 data points across 15 retailers

19 retailers€4,925 EUR to €8,937 EUR

A
Cheapest Retailer
-
€4,925 EUR
$5,502 USD
B+
Retailer 2
-
€5,066 EUR
$5,660 USD
View
B+
Retailer 3
-
€5,072 EUR
$5,666 USD
View
B+
Retailer 4
-
€5,135 EUR
$5,737 USD
View
B+
Retailer 5
-
€5,362 EUR
$5,990 USD
View
Final sale: no returns
B+
Retailer 6
-
€5,397 EUR
$6,030 USD
View
B+
Retailer 7
-
€5,721 EUR
$6,391 USD
View
B+
Retailer 8
-
€5,917 EUR
$6,610 USD
View
Retailer 9
-
€5,917 EUR
$6,610 USD
View
Price last confirmed 17 days ago
B+
Retailer 10
-
€6,109 EUR
£5,374 GBP
View
Retailer 11
-
€6,197 EUR
$6,923 USD
View
Price last confirmed 25 days ago
Retailer 12
-
€6,224 EUR
A$10,698 AUD
View
Price last confirmed 10 days ago
Retailer 13
-
€6,292 EUR
$7,029 USD
View
Price last confirmed 33 days ago
B+
Retailer 14
-
€6,596 EUR
£5,803 GBP
View
B+
Retailer 15
-
€6,819 EUR
View
Retailer 16
-
€7,150 EUR
$7,988 USD
View
Price last confirmed 33 days ago
B
Retailer 17
-
€7,879 EUR
ZAR 142,210 ZAR
View
B
Retailer 18
-
€8,937 EUR
£7,862 GBP
View
Most Expensive
NZ Jewellers
2cc99845-ad31-4206-9a33-efb150097eb4 · Sep 28
€10,363 EUR
$11,578 USD
View
Price last confirmed 34 days ago
18 more retailers have this diamond
Prices start from €4,925 EURSave up to €4,012 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
1.51ct Round
€4,925 EUR