Early gemological insights into inclusions or heat treatments that were becoming standard in the 80s.
Analysis of the "Chanthaburi-Trat" gem fields in Thailand or the ruby trade in Burma. Oriental Jewels Vol 2 n 3 (1982) PDF
A frequent host for public domain or donated digital scans of niche hobbyist magazines. Contextual Significance Oriental Jewels Vol 2 n 3 (1982) PDF
Vintage ads from major exporters that provide a "time capsule" of pricing and styles from 1982. Where to Find the PDF Oriental Jewels Vol 2 n 3 (1982) PDF
They often index historical trade journals and may have digitizations for members ( Society of Jewellery Historians ).