•
Top quality
Sapphire is valued for its ‘Pleochroic’
effect where the
gemstone changes
color intensity in
relation to a light source. Pleochroism is defined as
a body color effect, whereby ‘Different body colors
are seen in different directions of the
gems body.’
• Gem quality Sapphire sometimes exhibits a star
effect known as ‘Asterism’, this effect is enhanced
when a gemstone is cut and polished ‘En Cabochon’:
a dome cut with a flat bottom. The ‘Asterism’ effect
is caused by two or more sets of tiny parallel inclusions,
known as ‘Rutile’ or ‘Silk’, running the internal
length of the gem and intersecting at differing angles
with each other causing the reflected light to form
a star like formation across the gems face.