Antique Portuguese Diamond Ring by Leitão Irmão in Gold and Silver, Circa 1887

Leitão & Irmão Mid-Century Emerald and Diamond Platinum Cocktail Ring, Portugal, 1950s–1960s, in Original Case. A striking mid-century cocktail ring by Leitão & Irmão, the historic Portuguese jeweller to the Royal House, masterfully blending vivid emeralds with a scintillating diamond ensemble. The design centres on a round brilliant-cut diamond with approximately 1.20 carats, framed by a pair of square emerald-cut emeralds of deep, saturated green, weighing an estimated 2.00 carats in total. The trio is encircled by a dynamic halo of twenty marquise brilliant-cut diamonds, together weighing around 2.40 carats, their precise arrangement radiating brilliance from every angle. Exquisitely crafted in platinum and bearing the Lisbon hallmark (1938–1984) for platinum 500, as well as the maker’s mark for Leitão & Irmão, this jewel embodies the refined glamour of the 1950s–60s era — a time when bold form met impeccable craftsmanship. Presented in its original red leather fitted case, stamped “Leitão & Irmão, Antigos Joalheiros da Coroa, Lisboa”, this piece is a rare survivor of Portugal’s mid...

An early twentieth century pearl and diamond, three stone crossover ring, with an Art Nouveau influenced design, set with a natural pearl, between two old-cut diamonds, weighing appr...

Of marquise form set with old brilliant cut diamonds weighing approximately 2 carats, to a gold shank. Bezel 2.3 cm by 1.0cm. Finger size: 6 1/2 Weight: 4 gr

An English Antique 15 karat gold/silver top ring with sapphire and diamonds. The ring has a no heat oval-cut sapphire with an approximate weight of .9...

Beautiful Antique Victorian 18K Gold and Silver Rose Cut Diamond and Opal Engagement Ring. This incredible Victorian rose cut diamond and opal ring is crafted in 18k yellow gold and ...

A fine and impressive antique 0.70 carat diamond and 18 karat yellow gold, platinum set trilogy ring; part of our diverse antique jewelry collections. This fine and impressive antique three stone...

A stunning, fine and impressive antique pearl and 0.78 carat diamond, 14 karat white gold cocktail ring; part of our antique jewelry and estate jewelry collections. This stunning antique pearl and diamond ring...

A fine and impressive antique 0.40 carat diamond and 18 karat yellow gold, 18 karat white gold set three stone/trilogy ring; part of our diverse antique diamond jewelry and estate jewelry collections. This impressive antique three stone diamond ring has been crafted in 18k yellow gold with an 18k white gold setting. The pierced decorated mount displays three Old European round cut diamonds individually bezel set in millegrain textured 18k white gold mounts. The the subtly elevated,tapering ring shoulders blend seamlessly with the plain 18k yellow gold shank. This fine and original 1920s three stone ring is supplied with an independent diamond grading report card. This impressive antique ring has been independently tested using state of the art technology (Niton XL2 Analyzer) and verified as 18k gold. Condition This original antique trilogy ring...

A stunning, fine and impressive 0.73 carat diamond, 15 karat white gold and platinum set cluster ring; part of our diverse antique jewelry and estate jewelry collections. This stunn...

A fine and impressive antique French 0.81 carat diamond solitaire ring in 18 karat white gold; part our antique engagement ring collections. This fine and impressive French antique 0.81 carat diamond solitaire ring has been crafted in 18 karat white gold. This antique 1920s diamond solitaire features a 0.81 carat Old European cut diamond held in high relief in a principle eight claw, pierced decorated, elevated basket setting embellished with a fluted border. The elevated, tapered shoulders blend seamlessly into the plain 18 karat white gold shank. The exterior of the ring shank is hallmarked with the French 18k gold guarantee mark (eagle's head) and the maker's mark. This antique 1920s French diamond...