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Round|Natural|IGI

0.51ct K SI2 Round Natural Diamond

EX • K/SI2 • IGI 670418814

Shape and cutting style on the report: Round brilliant

Certificate IGI 670418814

Diamond specifications and retailer prices

From $275 USD
As of November 5, 2026
Save $971 USD (78%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,246 USD at NZ Jewellers · As of November 4, 2026
View at NZ Jewellers

About this 0.51ct natural round diamond

This 0.51ct natural round sits in the half to three-quarter carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 670418814. Listed at 13 retailers as of November 4, 2026, with prices from $275 to $1,246, a $971 spread on the same certified stone. NZ Jewellers lists it at $1,246. 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

0.51
Carat
K
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle32.5°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 670418814
Dimensions5.15 × 5.12 × 3.14 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
5.15 mm5.12 mm0.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI 670418814
Side View
Table 57.0%Crown 32.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.2%

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 5
Current: $387 USD|Low: $275 USD|High: $642 USD|Avg: $392 USD|+5.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 5, 2026
Retailer 4$275 USD
Retailer 6$285 USD
Retailer 9$289 USD
Retailer 11$296 USD
Retailer 8$345 USD
Retailer 1$387 USD
Retailer 2$405 USD
Retailer 10$405 USD
Retailer 3$413 USD
Retailer 12$450 USD
Retailer 5$526 USD
Retailer 7$635 USD

23 data points across 12 retailers

13 retailers$275 USD to $1,246 USD

A
Cheapest Retailer
-
$275 USD
A
Retailer 2
-
$285 USD
View
Retailer 3
-
$296 USD
View
Price last confirmed 8 days ago
A
Retailer 4
-
$307 USD
View
Retailer 5
-
$345 USD
View
Price last confirmed 42 days ago
Retailer 6
-
$370 USD
View
Price last confirmed 63 days ago
B+
Retailer 7
-
$370 USD
View
B+
Retailer 8
-
$387 USD
View
B+
Retailer 9
-
$405 USD
View
B+
Retailer 10
-
$526 USD
View
B+
Retailer 11
-
$635 USD
View
Retailer 12
-
$1,246 USD
View
Price last confirmed 66 days ago
Most Expensive
C
NZ Jewellers
6f82cb98-7cb0-4025-b245-448f57a419c4 · Nov 4
$1,246 USD
View
12 more retailers have this diamond
Prices start from $275 USDSave up to $971 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
0.51ct Round
$275 USD