CaratHunter
Plans
Round|Lab Grown|GIA

0.51ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • GIA 2558495929

Certificate GIA 2558495929

Diamond specifications and retailer prices

From £511 GBP
As of November 1, 2026
Save £420 GBP (45%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £932 GBP 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2558495929. Listed at 3 retailers as of November 1, 2026, with prices from £511 to £932, a £420 spread on the same certified stone. MOH London lists it at £932. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabGIA
CertificateGIA 2558495929
Dimensions5.15 × 5.13 × 3.18 mm
L/W Ratio1.00
Top View
5.15 mm5.13 mm0.51 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2558495929
Side View
Table 56.0%CrownGirdlePavilionCulet: NoneDepth 61.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £932 GBP|Low: £484 GBP|High: £967 GBP|Avg: £666 GBP|-1.1%
MOH London
Retailer 2
Retailer 3
November 1, 2026
Retailer 2£511 GBP
Retailer 3£523 GBP
MOH London£932 GBP

39 data points across 3 retailers

3 retailers£511 GBP to £932 GBP

B+
Cheapest Retailer
-
£511 GBP
B+
Retailer 2
-
£523 GBP
€668 EUR
View
Most Expensive
B
MOH London
DB336F46E · Nov 1
£932 GBP
View
2 more retailers have this diamond
Prices start from £511 GBPSave up to £420 GBP

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.

B+
0.51ct Round
£511 GBP