Keterdapatan Intan di Kalimantan
- Ultrahigh pressure (UHP) metamorphic origin; source from Meratus Complex -Peridotitic origin (Pearson et al., 1995); source from Bobaris peridotite (largely based on Koolhoven and van Bemmelen description).
- Meteoritic origin; presence of textites and impact-crater like structure in north Martapura
- Kimberlite/lamproite origin (Bergman et al, 1987;1988; Spencer et al, 1988); source from the cratonic core of central Borneo (now eroded)
- Lamproite origin (Parkinson et al, 2000); source from rifted Australian fragment containing diamondiferous craton.