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Secrets of the gem trade : the connoisseur's guide to precious gemstones
- "Connoisseur's guide to precious gemstones"@en
- "Handbooks and manuals"
- "Handbooks and manuals"@en
- "Secrets of the gem trade : the connoisseur's guide to precious gemstones"
- "Secrets of the gem trade : the connoisseur's guide to precious gemstones"@en
- "Secrets of the gem trade the connoisseur's guide to precious gemstones"@en