Hello Dino Hsu, In the original sutras (Buddhist scriptures) written in Sanskrit, the Seven Treasures are: 1. Suvarna 2. Rupya 3. Vaidurya 4. Sphatika 5. Musaragalva 6. Rohitamukta 7. Asmagarbha. They have been translated to different Chinese terms ,that even differed in various dynasties and to English terms as well later. It is obvious that there are many interpretations of the Seven Treasures in Chinese and English with same Chinese term interpreted as different substances in Western literature and the only definitive list being the original in Sanskrit. It seems that the 硨磲 ( giant clam) was replaced in the Western literature by Tridacna . The White Coral was replaced by Pearl / Mother of pearl / Tridacna.So your list is possibly one of the Chinese translations ,while the 硨磲 Tridacna is interpreted differently in the English translation as a gemstone.

giant clam, I hope it helps.