0.51ct D SI1 Round Lab Grown 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 D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG803661808 or 803661808. Listed at 14 retailers as of October 25, 2026, with prices from £96 to £584, a £488 spread on the same certified stone. MOH London lists it at £584. 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.