corundum, ruby, sapphire, Thailand.12, gems

Credner presents a broad geographical account of Siam based on his extensive travels and field investigations, combining physical geography, geology, climate, vegetation, settlement, population, agriculture, communications, and economic development. He describes the major geographical regions of the country and relates their landscapes and patterns of human occupation to underlying geology and relief. Mineral resources and mining form part of the economic-geographical treatment, including Siam’s important tin industry and other mineral occurrences, while the gem-producing districts are considered within the wider discussion of natural resources. The work is particularly valuable as a detailed picture of Thailand in the early 1930s, shortly after the political changes of 1932, and contains numerous photographs, maps, and observations derived from Credner’s own fieldwork. For gemological purposes its importance lies chiefly in the geographical and geological context it provides for Siam’s mineral and gemstone resources rather than in detailed mineralogical descriptions.

corundum, Burma.12, gems

gems, glyptic, engraved gems, agate, cameo, intaglio

After studying the dawn of Roman art in a foundational work on the history of architecture (Hellenistische Bauten in Latium, 1907–1912), and exploring iconography through Antike Porträts (1912) and Bildnisse römischer Kaiser (1914), Richard Delbrueck turned his attention to its twilight. Under the auspices of the German Archaeological Institute’s collection on late or lingering antiquity, he published within a decade three lavish volumes: Die Consulardiptychen und verwandte Denkmäler (from 1926), Antike Porphyrwerke (1932), and the present volume, which gathers portraits of Augusti, Caesars, and empresses from Constantine’s reign to the fall of the Western Empire. The coin effigies on the first twenty-five plates serve as a narrative thread and also illustrate the difficulty of accurate identification. As Delbrueck notes (p. 9), imperial portraits are always tendentious; each emperor constructs a vision of majesty not by merely idealizing his features, but by emulating a recent or ancient illustrious model. “Generally, a son adopts his father’s portrait when the latter ruled, and only slowly—if at all—develops his own individuality. This already contributes, despite differences, to the familial resemblance among the princes of Constantine’s house. An unrelated predecessor may exert the same influence: the portraits of Constantius II, Theodosius II, and Valentinian III clearly inspired those of their successors. Usurpers readily borrow the features of the legitimate emperor… When there are multiple sons, the younger imitate both their father and eldest brother… Some princes also drew inspiration from great figures of the past: Constantine, for example, from his supposed ancestor Claudius Gothicus, even more from Augustus, and perhaps from Alexander… When several of these factors act simultaneously—as often happens—the same emperor may be represented by several equally official portrait types.”

corundum, Sri Lanka.12, gems

Burma.12, corundum, ruby, sapphire, gems

corundum, USA.12, Montana.12, gems

corundum, Burma.12, gems

corundum, ruby, sapphire, Burma.12, India.12, gems

corundum, quality.10, gems

corundum, Sri Lanka.12, gems