How to Buy Alexandrite: Complete Guide

## The Most Remarkable Optical Phenomenon in Gemology Alexandrite is chrysoberyl that changes color depending on the light source: green in daylight, red under incandescent light. This color-change effect occurs because alexandrite absorbs light in a narrow band of the yellow spectrum, allowing both green and red wavelengths to pass. Daylight is richer in blue-green wavelengths, so the stone appears green. Incandescent light is richer in red wavelengths, producing the red appearance. First discovered in Russia's Ural Mountains in 1830, alexandrite was named after Tsar Alexander II. Russian material is essentially exhausted. Today, the primary sources are Brazil, Sri Lanka, India, and Tanzania. ## Evaluating Color Change The most important quality factor in alexandrite is the degree of color change — how dramatically and completely the stone shifts between its two colors. | Color Change | Daylight Color | Incandescent Color | Value | |-------------|---------------|-------------------|-------| | Strong (100%) | Vivid green | Vivid red | Maximum premium | | Moderate (60-80%) | Bluish green | Purplish red | High value | | Weak (30-50%) | Yellowish green | Brownish red | Moderate | | Slight (<30%) | Grayish green | Brownish | Significantly discounted | The ideal alexandrite shows "emerald by day, ruby by night." In practice, most stones exhibit a bluish-green to purplish-red change rather than pure green to pure red. The closer to the ideal, the higher the value. ## Origin and Character - **Russian (Ural)**: The original source. Strong green-to-red change. Essentially unavailable on the open market; museum-quality stones appear at auction occasionally. Prices start at $15,000+ per carat for any confirmed Russian material. - **Brazilian**: Often shows excellent color change with good saturation. The most available fine material today. Fine stones: $5,000-$15,000 per carat. - **Sri Lankan**: Typically larger but with weaker color change and more brownish-green tones. Good value: $1,000-$5,000 per carat. - **Indian (Andhra Pradesh)**: Variable quality, some excellent material. Moderate pricing. ## Size and Rarity Alexandrite is genuinely rare. Stones above 1 carat with strong color change are uncommon. Stones above 3 carats with strong change are museum-worthy. Prices escalate dramatically with size. | Size | Moderate Change | Strong Change | |------|----------------|---------------| | Under 0.5ct | $1,000-$3,000/ct | $3,000-$8,000/ct | | 0.5-1ct | $2,000-$5,000/ct | $5,000-$15,000/ct | | 1-3ct | $4,000-$10,000/ct | $10,000-$30,000/ct | | 3ct+ | $8,000-$20,000/ct | $25,000-$70,000+/ct | ## Lab-Created Alexandrite Synthetic alexandrite (Czochralski-pulled or flux-grown) is widely available at $5-$50 per carat. Lab-created stones show excellent color change and are chemically identical to natural. They are a legitimate option for buyers who want the color-change experience without the five-figure price tag. The key is disclosure. A natural alexandrite must come with a lab report confirming natural origin for any significant purchase. The price difference between natural and synthetic is 100x or more. ## Buying Recommendations - Always evaluate under both daylight (or daylight-equivalent LED) and incandescent light - Prioritize strength of color change above all other factors - Require a GIA or GRS report for stones above $1,000 — natural/synthetic distinction is critical - Brazilian alexandrite offers the best quality-to-price ratio - For engagement rings, alexandrite's 8.5 Mohs hardness is adequate but less durable than sapphire - Consider 0.5-1 carat stones for best value — the rarity premium above 1 carat is steep ## Red Flags - "Natural alexandrite" at suspiciously low prices (likely synthetic or color-change sapphire) - Color-change garnet or color-change sapphire marketed as alexandrite (different minerals entirely) - No lab certification for claimed natural stones - Photographs that exaggerate color change through lighting manipulation - "Russian alexandrite" claims without provenance documentation ## Evaluating Color Change in Person When shopping for alexandrite, bring a pen-style incandescent flashlight. Most jeweler showroom lighting is fluorescent or LED, which produces the daylight color. Switch between the flashlight (for incandescent color) and the showroom lighting to see the full change. Photographs of alexandrite are often misleading because cameras auto-correct white balance, exaggerating the perceived color change. Always evaluate color change in person whenever possible. ## Setting and Care Alexandrite at 8.5 Mohs is hard enough for daily ring wear, though it is slightly softer than sapphire. It has no cleavage, making it reasonably tough. For maximum display of color change, choose a solitaire or three-stone setting that allows ample light to enter the stone from multiple angles. Open-back settings allow both daylight and artificial light to interact with the stone more dramatically. ## Market Supply Realities The natural alexandrite market is small. Most retail jewelers do not stock natural alexandrite because the price point ($5,000-$30,000 per carat) puts it beyond typical inventory. Purchasing fine alexandrite usually means working with specialty colored stone dealers, auction houses, or high-end jewelers who maintain gemstone inventories. Online dealers specializing in colored stones (companies like Pala International, Multicolour Gems, and others) offer wider selection than brick-and-mortar stores. Always verify certifications and request detailed photos or videos before purchasing sight-unseen.