Dome Shaped Opal Ring with Rope and Ridged Sides in 10k Yellow Gold

A single elongated opal cabochon lies east-west across the top of this ring, domed and polished smooth, its white body shot through with flecks of green and orange that shift position as the hand turns. Twisted gold rope frames the stone along both long sides, and past the rope the shoulders drop away in fluted ridges that run down into the shank. The opal is held between those rope borders rather than clawed, so nothing interrupts its surface — you see the full length of the stone in one uninterrupted sweep. At 5.60 grams in 10k gold the mount has plenty of body behind it.

Opal is the only common gem that generates its own colour rather than simply transmitting it: the green and orange come from light diffracting through microscopic silica spheres, which is why the fire moves as you move and never photographs quite the same way twice. It is also October's birthstone, which makes this an easy answer for an autumn birthday. Worth knowing that opal is softer than quartz and holds a little water in its structure, so it wants to stay out of ultrasonic cleaners and away from long soaks — that is the trade you make for a stone nothing else looks like. Isn't a stone that changes in the light more interesting than one that doesn't?