Akademik

matura diamond
\\ˈmäd.ərə-\ noun
Usage: usually capitalized M
Etymology: from Matura (Matara), town in southern Ceylon
: zircon that is naturally or artificially made colorless

* * *

/mah"teuhr euh, mat"euhr euh/, Jewelry.
a zircon heat-treated to render it colorless: not a true diamond.
Also, Matara diamond.
[1875-80; after Matura, town in Sri Lanka]

Useful english dictionary. 2012.