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0.51ct F I1 Round Lab Grown Diamond

EX • F/I1 • IGI LG816670138

Shape and cutting style on the report: Round brilliant

Certificate IGI LG816670138

Diamond specifications and retailer prices

From $142 NZD
$80 USD
As of November 1, 2026
Save $1,160 NZD (89%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $1,302 NZD at MOH London · As of November 1, 2026
View at MOH London

About this 0.51ct lab-grown round diamond

This 0.51ct lab-grown round sits in the half to three-quarter carat band, graded F colour (colourless) and I1 clarity (included), with a top-tier cut grade and certified by IGI LG816670138 or 816670138. Listed at 9 retailers as of November 1, 2026, with prices from $142 to $1,302, a $1,160 spread on the same certified stone. MOH London lists it at $1,302. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

0.51
Carat
F
Colour
I1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle35.2°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816670138
Dimensions5.07 × 5.13 × 3.09 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
5.07 mm5.13 mm0.51 ctF / I1
OriginLab Grown
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG816670138
Side View
Table 61.0%Crown 35.2°Girdle: Slightly ThickPavilion 40.2°Culet: NoneDepth 60.4%

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 1
Current: $1,302 NZD|Low: $142 NZD|High: $1,309 NZD|Avg: $443 NZD|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 1, 2026
Retailer 9$142 NZD
Retailer 5$165 NZD
Retailer 3$188 NZD
Retailer 7$188 NZD
Retailer 8$386 NZD
Retailer 4$571 NZD
Retailer 2$634 NZD
Retailer 6$727 NZD
MOH London$1,302 NZD

7 data points across 9 retailers

9 retailers$142 NZD to $1,302 NZD

A
Cheapest Retailer
-
$142 NZD
$80 USD
B+
Retailer 2
-
$165 NZD
$93 USD
View
B+
Retailer 3
-
$188 NZD
$106 USD
View
Retailer 4
-
$188 NZD
$106 USD
View
Price last confirmed 8 days ago
B+
Retailer 5
-
$386 NZD
$217 USD
View
B+
Retailer 6
-
$571 NZD
$321 USD
View
B+
Retailer 7
-
$634 NZD
$357 USD
View
B+
Retailer 8
-
$727 NZD
$409 USD
View
Most Expensive
B
MOH London
LG816670138 · Nov 1
$1,302 NZD
£577 GBP
View
8 more retailers have this diamond
Prices start from $142 NZDSave up to $1,160 NZD

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
$142 NZD