Demantoid (Garnet)

Color: Green, Emerald Green
Moh’s Hardness: 6.5-7
Refractive Index: 1.88-1.89
Critical Angle: 32.13°
Specific Gravity: 3.82-3.85
Cleavage: Imperfect
Fracture: Subconchoidal
Heat Sensitivity: Yes
Birefringence (double refraction): 0.057
Crystal Structure: Isometric, rhombic, dodecahedron,icositetrahedron

Treatments: Generally none

What I prefer to polishing with: Alumina oxide with a tin lap (scored).

Jeff's Comments: Typically has horse hair type inclusions/needles, seldom over a gram rough (usually 1-3 carats). Rough is hard to find...

Design Notes: Design choice is limited by the small size and inclusions, I generally cut a simple checker board that is as deep as I can cut from the rough.

Melanite - Opaque black variety (Andradite)
Topazolite - lemon/yellow variety of Andradite (similar to Mali Garnets)

Design Links:
Tic Tac - Good for dark material
Smith Bar - Great for any material
Brilliant Pear - Nice in about anything

Rough Links:
Garnet - Index of Garnet Rough
Parcels of Garnets - Various Parcels

Almandine - Bright red, Rose Mayala, Malai Garnets
Collector Garnets - Mint
Color Change Garnets - Voi color change
Grossular - Mali Garnets, Madagascar light pink
Pyrope - Arizona Anthill, Grape Garnets, Blood Red
Rhodolite - Tanzanian, Lilac Garnets
Rhodolite 2 - Kangala purple/pink/red
Rhodolite 3 - Umbalite Garnets
Rhodolite 4 - Mombo Garnets
Spessartite - Spessartite Garnets of various types
Spessartite 2 - Malaya Garnets
Tsavorite - Tsavorite Garnets

Bargain Links:
Garnets Bargains

Return to Garnet Information Index

E-mail to inquire or order: jeff@faceters.com