Top Quality Natural Grandidierite Loose Gemstone
A rather rare
mineral, lovely blue-green grandidierite is seldom seen in gem or
jewelry collections. Translucent material is sometimes cut into
cabochons. Faceted pieces are very rare, but recent discoveries of
transparent material may bring more to the market.
has a hardness of 7.5, which makes it very resistant to scratching and
ideal for jewelry use. However, it also has perfect and good cleavage in
two directions, which makes it challenging to cut. Of course, its
scarcity has also made this a relatively little known gemstone.
its initial discovery, samples of grandidierite have been found in only
a few locations around the world, including Malawi, Namibia and Sri
Lanka. But the few gem quality specimens have come mainly from
Grandidierites display strong trichroic pleochroism.
That means they can show three different colors depending on the viewing
angle: dark blue-green, colorless (sometimes very light yellow), or
Grandidierite is considered one of the rarest and
most expensive gemstones in existence. It can fetch prices up to $20,000
Since grandidierite is so rare, we took several
specimens to GIA in Bangkok for verification. GIA confirmed the samples
as natural untreated grandidierite and they issued special reports (GIA
Notable Letters) on several of the gems. The gems are described as
"extremely rare" with "very high transparency," with grandidierite
characterized as "one of the rarest gemstones on Earth."