Show the luster of opals many gems often without any apparent cause suddenly become cracked or seamed the damage being belond ond repair opals known as the un luckless luc klest eat stones are so sensitive that their beauty Is frequently destroyed by wen wear bearers wearers TL ers rs proximity to an open lire fire the luster of this stone Is caus ed by the presence of myriads of little fissures which deflect the light into the characteristic prismatic color of the gem fiem the tiniest ot of these fissures is ie likely at any moment to destroy tho the stone |