Diamond Laboratories v. Topy Industries

Summary

Diamond Laboratories sued Topy Industries for defective plastic housing components that caused cracking in Diamond's Vibes Roll-On Deodorant product. The RTC initially ruled for Diamond, finding Topy liable under Civil Code provisions for good faith and contractual performance, awarding over P1 million in damages. However, the Court of Appeals reversed, finding Diamond failed to prove its case by preponderance of evidence and that its witnesses were incompetent to determine the cause of cracking. The Supreme Court affirmed the CA decision, emphasizing that Diamond failed to investigate whether the bottle specifications from third-party supplier Armel remained consistent across all batches before attributing fault to Topy. The case demonstrates the importance of thorough investigation in product liability claims and the burden of proof in commercial disputes involving multiple suppliers.