Chemical formula: Ca₂Al₃(SiO₄)(Si₂O₇)O(OH) · Mohs hardness: 6 to 7.
Material archive
Know what you wear.
Material knowledge is part of the piece. We distinguish verified facts from natural variation and make no unsubstantiated claims about effects or benefits.
Natural variation
Colour is a characteristic, not a promise of uniformity.
Natural stones can vary considerably within the same designation. Light, cut and screen settings also affect how colour and depth are perceived.
Our images show the jewellery design. Colour and shape may vary slightly; colour profiles provide guidance.
Zoisite greenGreen zoisite areas
Ruby redRuby-bearing areas
Dark companion mineralsNaturally variable inclusions
Example · Ruby zoisite
A natural mineral aggregate.
Chemical formula: Al₂O₃ · Mohs hardness: 9.
The formulae identify the zoisite and corundum phases. Ruby zoisite is a natural mineral aggregate; the type and proportion of other companion minerals may vary.