All varietes of corundum (ruby and sapphire) are subjected to
heating. The practice goes back at least a thousand years. Today,
with the ability to precisely control the temperature and duration
of the process heat treating has become ubiquitous. A heat treated
sapphire is not a "false" sapphire. Heat can only affect whatever
chemicals are present, fine heated stones are very rare, though not
as rare as their unenhanced bretheren.
It is done to improve the beauty, color and clarity of the gem. Heat
can clarify the crystal and improve the color in ruby and sapphire.
Padparadascha, is a light to medium toned pinkish orange to orangy
pink sapphire. The word comes from the Sinhalese "padma raga"
meaning "color of the lotus". Heat treated or natural, it is a very
I have bought padparadascha stones in Asia and Africa. I currently
have two, both heat enhanced. For further on saphire I
suggest my book, check out the link below.
For Information and sample chapters from my new book: