SALE!! EWOBM-1 and EWOBM-2: The rough opals in this grade of Welo opals range from 2 to 6 grams each and are nugget-like stones with a small amount of matrix on some pieces. This opal is considered “B” grade opal…not quite as bright as “A” grade rough opal with a bit less yield…but still good cutting material in its own right. Approximately 8-10 ounce to the ounce (31.1gm). This is great opal to sharpen your opal cutting skills instead of cutting, and possibly wasting, more costly gem grade opal…and you will still finish out a delightful stone. Was $195/ounce now $160/ounce or 2 ounces was $350.00 now $295.00 plus $10.00 shipping.