Cremation is a method of final disposition wherein combustion, vaporization, and oxidation turns cadavers to basic chemical compounds, such as gases, ashes and mineral fragments retaining the appearance of dry bone. Cremation may serve as a funeral or post-funeral rite as an alternative to the burial or interment of an intact dead body. Cremated remains (also known as "cremains" or simply "ashes"), which do not constitute a health risk, may be buried or interred in memorial sites or cemeteries, or they may be retained by relatives and dispersed in various ways.
Cremating any human body is absolutely forbidden in Islam, and the will to be cremated is invalid , because human being is honoured in Quran ( We have honoured the children of Adam, and We have carried them on land and sea, and granted them from good things, and preferred them above many of our creatures a marked preferment.( Sura 17, Verse 70).
It is also not allowed to use the ashes in making memorial jewelleries or any thing else. It must be buried only.
Cremation of any human body is not allowed in Islam because every human being is dignified as a human being. No circumstance can allow cremation of human body.