Volume 4 is complete.
Sometimes the mangaka will pepper in footnotes on the pages, but they're extremely tiny and hard to read. So have them here.
Notes (present in the original):
Pg 121: 1. Period beginning in the 1900s, under the reign of King Edward VII. Designs during this time were characterised by a sense of urban sophistication. 2. Small pearls that measure no more than 2mm in diameter. Name originates from their small size. Very popular.
Pg 126: Taken from the 'The Curious Lore of Precious Stones' by George Frederick Kunz, translated by Ryuji Kagami. (t/l note: available at the Gutenberg Project,
https://www.gutenberg.org/ebooks/57978, chapter VII)
Pg 131: The name originates from the Greek word 'dendron', meaning tree.
Pg 133: A type of wax specifically used for making prototypes of jewelry.
Pg 135: Chemical vapour disposition (CVD), a method by which synthetic diamonds are made.
Pg 152: The era under the reign of Queen Victoria (from 1837 to 1901). A golden age of gorgeous British culture and fashions.