Moissanite Promise Ring Set, 2 Stackable Rings, 925

This is a two ring set, and the point of a set is how the rings behave together. Each band is slim enough to stack, so you can wear both side by side, split them across two fingers, or add them to a ring you already own. The design combines a round brilliant cut with a heart motif, so there is a classic note and a sentimental one in the same pair. Stackable rings also protect each other, because neither takes every knock alone.

The stones are D colour, VVS1 clarity moissanite. D is the top of the colourless scale, so there is no warm tint, and VVS1 means inclusions are invisible without magnification. On small stones those grades are mostly about consistency, because two rings worn together should match each other exactly. Moissanite has a refractive index of about 2.65, higher than diamond's 2.42, and rates 9.25 on the Mohs scale, so the pair stays bright and keeps its polish through daily wear.

Sizing is the decision that matters. The range starts at size 6 and runs up through 6.5, 7, 7.5, 8 and 9, with larger sizes beyond that. Because the rings sit together, order the size that fits your widest knuckle comfortably, since a stack feels tighter than a single band. The set comes in a silver or gold finish over 925 sterling silver. Silver reads cool and white against the stones, and gold gives a warmer look that suits promise gifts and anniversaries.

• Stone: round brilliant moissanite, D colour, VVS1 clarity
• Set: two stackable rings with heart design
• Metal: 925 sterling silver
• Finish: silver or gold
• Ring sizes: 6, 6.5, 7, 7.5, 8, 9 and up
• Style: promise or wedding gift set