Zultanite (colour-change diaspore) shifts between green in daylight, champagne indoors, and pink–lilac under warm light. Its scarcity is real — single-source origin, low gem yield, and difficult cutting — but “rarer than diamond” multipliers are marketing, not measured facts. These answers cover the colour states and how to read rarity claims honestly.

Why do some Zultanite stones show pink or lilac tones?

Under warm artificial light — incandescent bulbs or candlelight — colour-change diaspore can shift from green toward raspberry-pink and lilac. The effect comes from trace elements in the crystal interacting with the light’s spectrum. A strong, clean pink–lilac shift is uncommon, which is why collectors prize it.

What colours can Zultanite show in daylight?

In daylight or fluorescent light, Zultanite reads greenish — from a soft green to a vivid “kiwi” green in finer material. As light warms toward sunset, many stones pass through champagne and olive tones before reaching the pink side under warm artificial light.

What colours can Zultanite show under artificial light?

Under warm artificial light such as incandescent bulbs or candlelight, Zultanite shifts toward pink, raspberry, and lilac. This warm-light state is the opposite end of its daylight green and is the look most associated with the gem, though its strength varies by stone.

Is Zultanite really rarer than diamond?

You will see “10,000” or “11,000 times rarer than diamond,” but these figures vary between sellers and do not trace to a measured, primary source — and “rarer than diamond” has no agreed unit. Zultanite is genuinely scarce, but a precise multiplier versus diamond cannot be verified.

Are pink Zultanite stones more valuable?

A strong, clean shift into pink and lilac under warm light is uncommon and sought-after, so well-saturated pink–lilac specimens are desirable. But value depends on the whole stone — clarity, cut, size, and overall colour-change strength — not the pink tone alone. “Rarest colour in nature” is marketing, not a measured fact.

How can I see a Zultanite’s colour change properly?

View the stone under two genuinely different light sources: a true daylight source and a warm incandescent bulb or candlelight — not two similar LEDs. The green-to-pink shift should appear and reverse as you switch. Remember the effect’s strength differs from stone to stone.