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Thousands of Dutch residents spent time digging through their garbage after they learned that they might have thrown away a diamond. A local jeweler sent 4,000 clients a mailing marking the tenth anniversary of his store. Two hundred of the envelopes contained a small diamond, while the others contained cubic zirconium, a cheap substitute used in costume jewelry. Many people who received the letter ignored it, thinking it was junk mail and threw it away without looking inside. When only a few people responded to the mailing the jeweler called...