Hessonite, the “cinnamon stone”, is grossular garnet spiced orange-brown by iron and manganese — with a characteristic swirled, honey-like interior that gemologists affectionately call its “heat wave” effect. Sri Lanka remains the classic origin; hardness about 7.Each hessonite at GEMIC Institute is natural and untreated, certified by our laboratory and shown in real photos and video. Unique gems; worldwide tracked delivery with our 30-day guarantee.