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HPJ CONNOISSEURS PORTFOLIO: EXTREMELY RARE 10.07 CARAT VVS PAIR OF SRI LANKA SILLIMANITES
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Product information
Discreet item
VERY RARE SIZE AND CLARITY 10.07 CARAT VVS PAIR OF SRI LANKAN SILLIMANITES.
GEM TYPE: NATURAL SILLIMANITE
CARAT WEIGHT: 10.07 CARATS (COMBINED)
DIMENSIONS: 11.00 x 9.00mm
COLOUR: RARE YELLOWISH GREEN
CLARITY: VVS
CUT: OVAL CUT
ORIGIN: OKAMPITYAH, SRI LANKA
TREATMENTS: NONE
A very striking closely matched pair of Sri Lankan Sillimanite’s. It is extremely rare to encounter a pair of this size and clarity – exceptional.
Sillimanite is an extremely rare and lesser known collectors gem. Sillimanite is actually a polymorph of both Kyanite and Adalusite, as all three gemstones share the exact same chemical composition (Al2SiO5), but each exhibit differing unique crystal structures. Sillimanite forms as orthorhombic, hexagonal crystals, whereas Kyanite and Andalusite crystals are both formed as triclinic crystals. Sillimanite is the rarest of these three closely related materials. Kyanite is known for its varying hardness and it also forms at much higher temperatures and pressure than Sillimanite. Like Andalusite, Sillimanite may also exhibit pleochroism, but not nearly as pronounced as it is seen in Andalusite.
Sillimanite is almost always grayish to brown in non-gemstone deposits. Rarer colors, which are often used as gemstones include bright yellow, greenish-yellow, light-bluish, and violet to purplish-brown.
