How to identify Faceted Gemstone

To correctly identify Faceted Gemstone (Mineral (specific identification not possible from image)), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.

Step-by-step identification

1. 1

   Color

   Overall color and any zoning or banding

   Highly variable, depending on the specific mineral. Can range from colorless to every color of the spectrum, often with variations in hue, tone, and saturation.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Typically vitreous (glassy) to adamantine (diamond-like) due to polishing, but can vary based on the mineral's inherent properties.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Smooth and polished on the faceted surfaces; sharp edges where facets meet.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Not applicable to the faceted form, as the original crystal habit has been altered by cutting. The internal structure, however, reflects the original mineral's crystal system.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   May or may not be present, depending on the specific mineral. Cleavage planes can sometimes be observed internally or as weaknesses in the stone, but are generally avoided during faceting.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Varies widely depending on the specific mineral. Gem-quality minerals form in diverse geological settings, including pegmatites, hydrothermal veins, metamorphic rocks, igneous intrusions, and alluvial deposits.

Key Facts

Hardness

Varies widely (e.g., Diamond: 10; Corundum (Ruby/Sapphire): 9; Topaz: 8; Quartz: 7 on Mohs scale)

Specific Gravity

Varies widely (e.g., Diamond: 3.52; Corundum: 4.00; Quartz: 2.65)

Crystal System

Varies widely (e.g., Cubic, Hexagonal, Trigonal, Orthorhombic, Monoclinic, Triclinic)

Color

Highly variable, depending on the specific mineral and trace elements.

Luster

Vitreous to adamantine, due to polishing.

Transparency

Typically transparent to translucent, as opaque minerals are rarely faceted.

Fracture

Varies widely (e.g., conchoidal, uneven, splintery), depending on the specific mineral.

Cleavage

Varies widely (e.g., perfect, good, indistinct, none), depending on the specific mineral.

Composition

Varies widely, as a 'faceted gemstone' can be any gem-quality mineral (e.g., Carbon for diamond, Al2O3 for corundum, SiO2 for quartz).

Physical characteristics

• Crystal Habit: Not applicable to the faceted form; refers to the original mineral's growth habit.
• Cleavage Type: Varies widely (e.g., perfect, good, distinct, indistinct, none) depending on the specific mineral.
• Fracture Type: Varies widely (e.g., conchoidal, uneven, splintery, subconchoidal) depending on the specific mineral.
• Tenacity: Varies widely (e.g., brittle, tough, malleable) depending on the specific mineral.
• Luster Type: Vitreous (glassy) to adamantine (diamond-like) due to polishing, but can also be sub-adamantine or resinous depending on the mineral.

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