Eudialyte is a very rare zirconium-bearing mineral. The eudialyte offered for sale here occurs in association with a suite of other zirconium minerals, at Sheffield Lake, near Kipawa, Quebec. Rough eudialyte occurs in massive form and is usually heavily fractured and included. A very small portion of this material is suitable for faceting, yielding gems that are typically included and fractured. Clean faceted gems of any size are extremely rare.
Eudialyte has a hardness of 5 - 5.5 on Moh's hardness scale and is fairly fragile, making its use in jewellery limited to earrings and pendants. Faceted eudialyte is considered too soft to set in rings.