Thank you for submitting your item for appraisal. This appears to be a glass table top by artisan glass studio Alchemy Glass and Light, Michael Murphy and Steve Weinstock. Few items by Michael Murphy have been offered or sold at auction. The estimate is therefore rather vague. Modern glues with a refractive index identical to glass can be used to restore broken glass. The estimate it based on similar items by lesser known artist sold or offered at auction. Gallery prices are usually higher and can vary.