CaratHunter
Plans
Round|Lab Grown|IGI

0.51ct I SI1 Round Lab Grown Diamond

VG • I/SI1 • IGI LG300914

Certificate IGI LG300914

Diamond specifications and retailer prices

From £644 GBP
SGD 1,166 SGD
As of October 31, 2026
Save £9 GBP (1%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £653 GBP at Fonder Diamond · As of October 31, 2026
View at Fonder Diamond

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 very-good cut grade and certified by IGI LG300914 or 300914. Listed at 2 retailers as of October 31, 2026, with a relatively tight 1% spread, which is unusual at this carat range and suggests competitive pricing across the listings. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

0.51
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG300914
Dimensions5.07 × 5.10 mm
L/W Ratio1.01
Top View
5.07 mm5.10 mm0.51 ctI / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG300914
Side View
Table 56.0%CrownGirdle: THN - STKPavilionCulet: NDepth 62.7%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £653 GBP|Low: £312 GBP|High: £824 GBP|Avg: £550 GBP|-0.4%
Fonder Diamond
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 13, 2026
Retailer 6£312 GBP
Retailer 3£384 GBP
Retailer 2£425 GBP
Fonder Diamond£653 GBP
Retailer 5£698 GBP
Retailer 4£824 GBP

4 data points across 6 retailers

2 retailers£644 GBP to £653 GBP

B
Cheapest Retailer
-
£644 GBP
SGD 1,166 SGD
Most Expensive
B
Fonder Diamond
97043650 · Oct 31
£653 GBP
SGD 1,183 SGD
View
1 more retailer has this diamond
Prices start from £644 GBPSave up to £9 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
£644 GBP