1ctw Princess Cut Moissanite Ring, Adjustable 925 Silver

Princess cut is the square brilliant. It has the same light return as a round stone but with straight sides and sharp corners, which gives a modern, geometric look and sits neatly beside a plain band. The corners are the weak point of any princess stone, which is why they are normally covered by prongs. The stones here measure 4.5mm and the total weight is 1ctw. The band is 925 sterling silver and made to be adjustable, so it can open slightly to suit the finger.

The stone is moissanite and the ring is listed as certified, so the grade is documented rather than taken on trust. Moissanite has a refractive index of about 2.65, higher than diamond's 2.42, and a hardness of 9.25 on the Mohs scale, close enough to diamond's 10 that daily wear on a ring finger does not dull it. That hardness is the reason moissanite is a serious choice for a wedding band and not only for costume pieces.

Size is sold in ranges instead of single sizes. The listing runs from US 4 to 5.5, 5.5 to 6.5, 6.5 to 7.5, 7.5 to 8.5, 8.5 to 9.5 and 9.5 to 11, so pick the range your size sits inside, ideally near the middle. Adjustable bands are forgiving if your finger changes with temperature, and they suit gifts. If this is for a proposal, a fixed size is easier to match later. Finishes are gold, rose gold and silver colour.

• Stone: princess cut moissanite, 4.5mm, 1ctw, certificate included
• Metal: 925 sterling silver
• Finish: gold, rose gold or silver colour
• Sizes: US 4 to 11 in six ranges
• Band: adjustable