Alexandrite
Definition
A rare and highly valuable variety of chrysoberyl (beryllium aluminate) containing traces of chromium, characterized by the remarkable property of changing color depending on the lighting conditions (pleochroism). The gemstone appears emerald-green or bluish-green in natural daylight and shifts to raspberry-red, purplish, or violet under incandescent artificial light.
Bilingual Equivalents
- Alexandrite
- Color-change gemstone
Grammatical & Source Details
| Inflection Type | Neuter noun with standard structural singular layouts, plural modifications apply strictly to sample batches. |
| Formation | Named in honor of Tsar Alexander II of Russia, following the initial mineralogical identification in the Ural Mountains. |
| Spelling / Pronunciation | [ˌæl.ɪɡˈzæn.draɪt] |
| Source | Global Gemological Association Classification Standards and Mineral Compendium |
Contextual Usage Examples
RO: Inelul vechi din aur era montat cu un alexandrit natural de trei carate, de o claritate excepțională.
EN: The antique gold ring was set with a natural three-carat alexandrite of exceptional clarity.
RO: Geologul a explicat că prezența ionilor de crom din rețea determină efectul optic special observat la alexandrit.
EN: The geologist explained that the presence of chromium ions in the lattice dictates the special optical effect observed in alexandrite.
RO: Prețul per carat pentru un alexandrit de calitate superioară poate depăși valoarea multor diamante tradiționale.
EN: The price per carat for a top-quality alexandrite can exceed the value of many traditional diamonds.
Idioms & Phrases
Efect de alexandrit / Alexandrite effect / color-change phenomenon
RO: Proprietatea optică a unui mineral de a-și schimba dramatic nuanța cromatică atunci când sursa de iluminare se modifică.
EN: The optical property of a mineral to dramatically shift its chromatic hue when the illuminating source changes.
Alexandrit de Ural / Ural alexandrite
RO: Varietatea istorică originală extrasă din minele rusești, considerată standardul suprem de frumusețe și valoare în gemologie.
EN: The original historical variety extracted from Russian mines, considered the supreme standard of beauty and value in gemology.
Alexandrit sintetic / Synthetic alexandrite / flux-grown alexandrite
RO: Cristal creat în laborator prin metode hidrotermale, care imită perfect structura chimică și optic-cameleonică a pietrei naturale.
EN: A crystal created in the laboratory via hydrothermal methods, perfectly mimicking the chemical and optical-chameleon structure of the natural stone.
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