Ka kakaretso, ha re bua ka index ea lense ea resin, e tsoa ho 1.49 – 1.56 – 1.61 – 1.67 – 1.71 – 1.74. Kahoo matla a tšoanang, 1.74 ke a thinnest, matla a phahameng, phello e hlakileng haholoanyane.