As both Zircon and White opal with fire strengthens Venus (shukra), native often get confused. Zircon is not very costly and easily available. On the other hand, a good astrologer prescribes spiritual white fire opal only after a lot of considerations. In matters of health, Zircon is definitely a blessing and gives better results. Therefore, Zircon is a primary substitute to diamond whereas white opal is a secondary.