- Sapphires: Secrets, Science, and Splendor: How Sapphire Became a Collectible and Investment Gemstone (The Investment Gemstone Handbook Collection)
- Emeralds: Secrets, Science, and Splendor: How Emerald Became a Collectible and Investment Gemstone (The Investment Gemstone Handbook Collection)
- The Ruby: Secrets, Science and Splendor: How Ruby Became a Collectible and Investment Gemstone
- Tanzanites : Secrets, Science et Splendeur: Comment la tanzanite est devenue une pierre de collection et d'investissement (French Edition)
- Robocchio: Les aventures d’un petit robot aux grands rêves (French Edition)









