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Octahedral Diamond Ring, second half 3rd–early 4th century, Roman. Gold, diamond. Height including diamond 30.73 mm.; hoop outer diam. 25 mm.; bezel 6.32 x 8.55 mm.; weight 9.2 grams; US size 5.75; UK size L. Griffin Collection. © The Metropolitan Museum of Art

Double Gemstone Ring, ca. 300, Byzantine. Gold, pearl, emerald: Height of bezel 25 mm.; diameter inner hoop 20 mm.; weight 8.3 gr. Griffin Collection © The Metropolitan Museum of Art.

Roman, 4th century AD

Early Christian Gemstone Ring. Date: 4th–5th century CE. Culture: Roman. Medium: Gold, garnets, and emerald. Dimensions: Bezel 3 x 17 x 18 mm.; circumference 55 mm.; weight 4.2 gr. Classification: Metalwork-Gold. In the Metropolitan Museum of Art, New York.

Gold ring, the hoop terminating at shoulders supporting the triple "pie-dish" bezel set with a sapphire between two garnets, all "encabochon". 13th /14th centuries.

Late Antique Gemstone Ring Date: 4th century Culture: Roman Medium: Gold and garnets Dimensions: Hoop outer diam. 27.8 mm; hoop inner diam. 17.8 mm.; weight 5.04 gr.

"Shyugiku" (Autumn Chrysanthemum) by 15th generation,Kichizaemon Raku, 2000

Ring with intaglio portrait of Emperor Tiberius, 14–37 a.d.; Early Imperial. Roman. The Metropolitan Museum of Art, New York.

Momoyama period late 16th century, Katami, Oribe ware (green copper glaze and bold painted design. It was the first use of colored stoneware glaze by Japanese potters.)

MEDIEVAL GEMSTONE RING England,13th-14th century gold and sapphire Weight 1.4 gr; circumference 56 mm; US size 7 ¾; UK size P ½