Depends on many thing.
Perfume ingredients can be:
- Natural (from fully natural sources) or,
- Artificial from synthetic analogues of natural compounds (used to be called “Nature Identical” but this is deemed misleading now.
- Synthetic - from the laboratory only.
Geraniol can be sourced from Rose Geranium (Pelargonium graveolans) and the geraniol can be fractionated from the steam distilled geranium oil.
Geraniol can also be synthetically manufactured.
It can be the same for Citronellal (natural from lemon grass, or synthetic). Both can be combined with other natural perfume ingredients to make either a natural rose oil or a synthetic rose oil (depending on the source of the perfume chemicals). The manufactured stuff is cheap - but both the natural and synthetc perfumes can also be referred to as rose oil.
Rose absolute can be produced from rose petals and is very expensive. I’m not sure enfleurage is still used, but CO2 can be effective at extraction.
There are a number of truly synthetic flavour and perfume ingredients, such as ethyl vanillin, which was one of the first synthetic perfume chemicals.