GUIDES
Diamond & jewellery guides
Plain-language guides: the 4Cs, natural vs lab-grown, grading reports, ring sizes and gold purity.
The 4Cs of a diamond, explained simplyCarat, colour, clarity and cut – what each one means and where you can save money without seeing a difference.
Natural or lab-grown diamond?Both are real diamonds with the same hardness and sparkle. The differences are origin, price and resale value.
Diamond grading reports: GIA and IGIWhat a grading report contains, how to check its number, and why a report is not a valuation.
How to find your ring sizeIndian, US and European ring sizes, measured at home in two minutes – plus free resizing on most rings.
Gold purity, BIS hallmark and HUID14K, 18K and 22K in parts per thousand, and how to check the BIS hallmark and HUID of your jewellery.
Diamond shapes comparedRound, oval, princess, cushion, emerald, pear and more – how each shape looks on the hand and what to watch for.
Treated and clarity-enhanced diamondsWhat fracture filling, laser drilling and HPHT colour treatment are, how they are disclosed, and what they mean for price and care.