search
  • Iscriviti
    Registrati
  • Solo per i clienti di lingua inglese

    Gratuito - Solo USA e Canada:
    1-800-464-1640

    Internazionale:
    +66-39303404

  • Change Language
  • USD

Black Melanite Gemstones

Six common species of garnet are classified according to their chemical composition. These species are pyrope, almandine, spessartite, grossular, uvarovite and andradite.

One of the rarest of all the garnet varieties is andradite, the calcium iron garnet. It has the highest refractive index of all the garnets (1.89 to 1.94). The most famous of the andradite garnets is the very rare demantoid, which has a name meaning "diamond-like luster." In fact demantoid is among the rarest and most expensive of all colored gemstones.

Melanite Crystals
Melanite Crystals

Andradite was named after the Portuguese mineralogist José Bonifácio de Andrade e Silva (1763-1838). He discovered and described four minerals during his life, including spodumene and petalite. Working as a geology professor in Portugal, he spent many years in the Portuguese colony of Brazil. When the independence of Brazil was declared, Andrade was made minister of the interior and of foreign affairs.

Melanite - Round Facet
Click to Enlarge Photo
Melanite - Round Facet

The andradite species includes two other rarely-seen varieties; the yellow topazolite and the black melanite. Melanite is an opaque black stone with a very attractive sub-adamantine to vitreous luster. At one time it was rarely faceted as a gemstone. However, with the interest in black diamond, and the general scarcity of black gemstones, melanite has become a popular jewelry gemstone.

The black color of melanite is the result of titanium replacing some of the iron in its composition, and melanite is sometimes known as titanian andradite. Since garnet has excellent gemstone characteristics - good hardness and luster with no distinct cleavage - melanite is a versatile gemstone that can be used in rings, pendants, earrings and bracelets. It is also fairly inexpensive, selling at approximately the same price as black tourmaline. It is a very good alternative to more expensive gems such as black sapphire and black spinel, and superior to less expensive black gems such as onyx and jet.

  • Prima Pubblicazione: March-25-2009
  • Ultima modifica: January-22-2019
  • © 2005-2021 GemSelect.com Tutti i diritti riservati.
    Qualsiasi riproduzione (testi o immagini) è strettamente proibita senza esplicita autorizzazione scritta da parte di GemSelect.com (SETT Company Ltd.).
More Shapes
Le pietre più conosciute
  • Zaffiro
  • Smeraldo
  • Rubino
  • Acquamarina
  • Zircone
  • Opale
  • Topazio
  • Tormalina
  • Granato
  • Ametista
  • Citrino
  • Tanzanite
Tutte le pietre preziose (140)
A B C D E F G H I K L M N O P Q R S T V Z
  • Acquamarina
  • Acquamarina effetto occhio di gatto
  • Agata
  • Agata dendritica
  • Agata di fuoco
  • Amazzonite
  • Ametista
  • Ametrine
  • Ammolite
  • Andalusite
  • Andesina Labradorite
  • Apatite
  • Apatite effetto occhio di gatto
  • Avventurina
  • Azzurrite druzy
  • Berillo
  • Berillo dorato
  • Calcedonio
  • Cat's Eye Opal
  • Charoite
  • Cianite
  • Citrino
  • Clinohumite
  • Corallo
  • Corallo fossile
  • Cornerupina
  • Corniola
  • Crisoberillo
  • Crisocolla
  • Crisoprasio
  • Cromo diopside
  • Diamante
  • Diaspro
  • Diaspro cangiante
  • Diopside stellato
  • Druse emimorfite
  • Druzy Amethyst
  • Eliolite
  • Eliolite o pietra del sole
  • Eliolite o pietra del sole stellata
  • Ematite
  • Ematite o pietra del sangue
  • Enstatite
  • Fluorite
  • Fluorite che cambia colore
  • Gemme gatteggianti
  • Giada
  • Giadeite
  • Granato
  • Granato Malaya
  • Granato almandino
  • Granato cangiante
  • Granato del Mali
  • Granato demantoide
  • Granato di rodolite
  • Granato essonite
  • Granato grossularia
  • Granato piropo
  • Granato spessartite
  • Granato stellato
  • Granato tsavorite
  • Grandidierite
  • Howlite
  • Hyalite Opal
  • Idocrasio
  • Il geode di agata
  • Kunzite
  • Labradorite
  • Lapislazzulo
  • Larimar
  • Madreperla
  • Malachite
  • Matrice di occhio di tigre
  • Maw-Sit-Sit
  • Morganite
  • Nuummite
  • Occhio di gatto actinolite
  • Occhio di tigre
  • Occhio di tigre blu
  • Onice
  • Opale
  • Opale cioccolato
  • Opale doppietta
  • Opale macigno
  • Opale nera
  • Opale di fuoco
  • Opali in Matrice
  • Ossidiana
  • Ossidiana fiocco di neve
  • Peridoto
  • Perla
  • Pietersite
  • Pietra di Luna effetto occhio di gatto
  • Pietra di luna
  • Pietra di luna arcobaleno
  • Pietra di luna stellata
  • Pietre cangianti
  • Pietre stellate
  • Pirite arcobaleno
  • Prehnite
  • Pyrite
  • Quartz With Marcasite
  • Quarzo
  • Quarzo citrino stellato
  • Quarzo effetto occhio di gatto
  • Quarzo fragola
  • Quarzo rosa
  • Quarzo rosa stellato
  • Quarzo rutilato
  • Rodocrosite
  • Rubino
  • Rubino in fuchsite
  • Rubino stellato
  • Rubino zoisite
  • Scapolite
  • Scapolite effetto occhio di gatto
  • Scolecite
  • Serafinite
  • Serpentinite
  • Sfalerite
  • Sfene
  • Sillimanite
  • Sillimanite effetto occhio di gatto
  • Smeraldo
  • Smithsonite
  • Sodalite
  • Spectrolite
  • Spinello
  • Tanzanite
  • Topazio
  • Topazio imperiale
  • Topazio mistico
  • Tormalina
  • Tormalina rubellite
  • Turchese
  • Variscite
  • Zaffiro
  • Zaffiro cangiante
  • Zaffiro stellato
  • Zircone
Main Categories
  • Nuovi arrivi
  • Lotti di gemme
  • Gemme calibrate
  • Gemstones By Piece
  • Le pietre di massimo livello
  • Coppie
  • Gemme in cabochon
  • Drilled Gems, Briolettes and Beads
  • Le pietre portafortuna
  • Pietre incise
  • Gemme fantasia
  • Pietre stellate
  • Zaffiro non riscaldato
Solo per i clienti di lingua inglese

Gratuito - Solo USA e Canada:
1-800-464-1640

Internazionale:
+66-39303404

Risparmia denaro
Senza spese di spedizione per articoli aggiuntivi!
$8.90 spedizione in tutto il mondo

Update Translation
 
Current Value
New Value
GemSelect Gemstones
X Chiudi finestra
Colored Gemstones
X Chiudi finestra
Colored Gemstones
X Chiudi finestra
Colored Gemstones
Dimensioni e peso

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart