Coffin Cut Alexandrite & Moonstone Ring in Sterling Silver

In daylight the elongated center reads teal blue-green; under candlelight it turns violet, purple and plum. That real, dramatic color shift is the soul of this coffin cut alexandrite and moonstone ring — a substantial 7 × 10 mm color-change alexandrite cut in the striking coffin silhouette, flanked at each shoulder by a glowing marquise rainbow moonstone and paired clusters of simulated diamond. Set in solid 925 sterling silver with a rhodium finish, it fuses gothic structure with celestial shimmer into a ring that never looks the same twice.

A stone that reads as two

Alexandrite is famous for one extraordinary trick: it changes color with the light. In daylight or cool fluorescent light the coffin-cut center reads teal to blue-green; under incandescent bulbs, candlelight or a warm evening it shifts toward violet, purple and reddish-plum. The broad step-cut facets of the coffin shape catch that shift in long, clean flashes as your hand moves, so the transformation is genuinely visible in person. If the effect intrigues you, our explainer on whether synthetic alexandrite changes color covers the why, and you can browse the phenomenon across our alexandrite engagement rings.

The coffin cut, and what it means

The center is cut in a coffin shape — an elongated hexagon with angled shoulders tapering toward the base, echoing a classic casket outline. It has become the signature silhouette of gothic, dark-romance and alternative bridal jewelry: as structured as a kite or hexagon cut, but carrying a symbolism no other shape does. In gothic tradition the coffin reads as “til death do us part” made literal — eternal devotion and the beauty found in darkness. The elongated 7 × 10 mm proportions also stretch the stone flatteringly along the finger.

The lab-created alexandrite center

The center is lab-created alexandrite — genuine color-change chrysoberyl grown in controlled conditions, with the same chemistry, the same Mohs 8.5 hardness and the same chromium-driven shift as natural mined alexandrite. Origin matters most at this scale: natural alexandrite above a carat is among the rarest gems on earth, so lab creation is what makes a full 2.1-carat, full-shift stone something you can wear every day. For the full picture, our guide to lab-grown versus natural alexandrite is worth a look.

Rainbow moonstone and simulated diamond accents

At each shoulder sits a marquise natural rainbow moonstone, alive with adularescence — the floating blue-white glow that drifts across the stone as it catches light. Each moonstone’s flash is natural and slightly unique, and their soft lunar shimmer balances the sharp gothic geometry of the coffin, pulling the ring toward celestial, witchy territory. Beside the center, paired rounds of simulated diamond add a bright, crisp sparkle that bridges the alexandrite and the moonstones. Note that moonstone is softer than the alexandrite center (Mohs 6–6.5), so the accents appreciate a gentle hand.

Both June birthstones in one ring

Here is the detail that makes it uniquely giftable: alexandrite and moonstone are both June birthstones. June is one of the few months with more than one, and this design carries two of the three in a single ring — arguably the definitive June-birthstone piece. Solid 925 sterling silver, finished with rhodium for a bright white luster and added scratch and tarnish resistance, ties the cool palette together; the metal is nickel-free and hypoallergenic, and genuine sterling silver will not turn skin green. Couples who love the pairing often add a stacking band from our alexandrite wedding bands or a matching piece from our alexandrite jewelry. And if you are weighing this color-change center against a classic blue stone, our comparison of alexandrite versus sapphire is a helpful read.

Specifications

Sizing & care

True to size and comfort fit — choose your size at checkout, and if you are unsure, message us for guidance. Resizing is available and starts from a modest fee. The alexandrite center handles daily wear well, but the rainbow moonstone accents are softer, so treat them gently: avoid hard knocks, harsh chemicals, and ultrasonic or steam cleaners. Clean with warm water and a soft cloth, remove the ring before swimming or heavy work, and store it in the velvet box so the prongs and moonstones do not catch. A soft cloth keeps the rhodium finish bright and the color shift vivid.