valuable : admired, appreciated, beneficial, cherished, collectible, costly, dear, esteemed, estimable, expensive, heirloom, held dear, helpful, high-priced, hot property, hot, important, in demand, inestimable, invaluable, of value, precious, prized, profitable, relevant, respected, scarce, serviceable, treasured, useful, valued, worthwhile, worthy [EA]

for another sense of precious, read beloved