Gem of the Month

Each month this section will feature either a topic of interest to gem lovers or one special gemstone with background on the material and its value.

Go to: Homepage -- what's new in faceted gems -- what's new in designer cabochons and gem carvings -- gem of the month -- gem of the month archive -- birthstone of the month -- key to all the codes used on the ACS site -- definitions of terms used on the ACS site -- how to order -- about ACS -- about the ACS cutters -- settings for these gems --faceting information -- purchase UltraTec equipment

-- Mail to barry@acstones.com

{Search our Catalog}


Clinohumite

June, 2000

This stone is virtually unknown outside the world of gem collecting, but deserves wider acclaim. Gem quality material was discovered in 1983 and is mined at only one location in the remote Pamir Mountains of Eastern Europe. It ranges in color from slightly orangey yellow, through orange to orangey brown. Cut pieces are small (generally under a carat) and may be included. The relatively high refractive index makes stones very brilliant and the hardness of slightly over 6 makes it useable for most jewelry applications, other than daily wear rings. Perhaps a few dozen stones have been cut world-wide. Some extremely rare gems are fragile or rather unattractive, but clinohumite is an exception in being both beautiful and reasonably durable.


Value

One of the world's rarest stones, fine gems of saturated orange color, good clarity and any size at all, bring very high prices. Hopefully recently renewed mining in the region will unearth new deposits and increase the supply for its many admirers.


Gemological Data:

Makeup: a magnesium, iron silicate

Luster: vitreous

Hardness: 6

Crystal structure: monoclinic

Flourescence: orangey yellow

Cleavage: poor

Density: 3.18

RI: 1.63-1.66

Birefringence: .037

Pleochroism: slight, yellow to orange


Stones Currently Available:

{Search our Catalog}

Go to: Homepage -- what's new in faceted gems -- what's new in designer cabochons and gem carvings -- gem of the month -- gem of the month archive -- birthstone of the month -- key to all the codes used on the ACS site -- definitions of terms used on the ACS site -- how to order -- about ACS -- about the ACS cutters -- settings for these gems --faceting information -- purchase UltraTec equipment