What Gemstones Have Trigons?

What Gemstones Have Trigons? many hard-rock (primary) mines are found in the mountainous terrain surrounding mogok, and they are sources of mainly ruby, sapphire, spinel, peridot and pegmatite Does quartz have Trigons? Trigons on diamonds usually have strait edges while trigons on quartz have cuved edges. Other minerals may show trigons, especially cubic minerals showing