Can this blade be used with water or must it be cooled with oil? If not which blade do you recommend for 14 in, water cooled lapidary saw? Tia

We generally do not recommend using straight water with any blade, especially any 10" or bigger. If you choose to use water with this blade, or any others, we recommend using an additive, like gem lube (7-0373), that will keep the blade cooler and inhibit rust from forming.