A superb modernist 18K yellow gold pendant set with a large bi-color tourmaline. Haroldo Burle Marx was particularly known for his bold use of very large gemstones, often fashioned by carving or tumbling rather than faceting. The color of this tourmaline shades from deep green to deep purplish-red. The gold mounting which slightly mimics the outline of the tourmaline is decorated with stippling and Florentine engraving...

An elegant 18K yellow gold ring set with a faceted amethyst by famed mid-century Brazilian designer Haroldo Burle Marx. The sculptural quality of the design is highlighted by the contrast of wire-brushed and polished surfaces surrounding the deep violet amethyst. The interior of the shank is fully signed "Burle Marx 18K" and has Brazilian hallmarks.

Burle Marx worked in Brazil, and his only international boutique was at the Watergate Hotel in Washington, DC...

An extremely rare 18K yellow gold Sputnik bracelet by H Stern. The domes are bezel-set with round amethysts, citrines, aquamarines, peridot, green tourmalines, pink tourmalines, and garnets. The Sputnik design was created in the 1950s to highlight the range of colored gemstones available from Stern's Brazilian mines. It later came to be called "Sputnik" for its resemblance to the spiky Soviet satellite launched in 1957...

A classic 18K yellow gold tapered band by Tiffany & Co. set at the crown with an oval cabochon citrine. The stone has very nice slightly orangey-yellow color and eye-clean clarity. The ring has a very solid feel and can be worn by either a man or woman. The interior of the shank is marked “750” for 18K and is signed by Tiffany. This ring is no longer available at Tiffany, but originally sold for $2,150.

• Italy, ca...

A fascinating 18K yellow gold cocktail ring featuring a "forma livre" (free-form) amethyst by the famed mid-century Brazilian designer Haroldo Burle Marx. Burle Marx invented the technique of carving and tumbling forma livre stones in 1948, and the style became his signature. The amethyst chosen for this ring has distinct color zoning that creates an interesting interplay of deep and light purple coloring. The setting is finished in the florentine style typical of Burle Marx's work...

These lovely, 18K gold, Tiffany & Company earrings are designed by Paloma Picasso. They are the classic "Scribble" design and measure just under 1 1/2" x 5/8" (at their widest point). They are each marked, "1983 Tiffany & Co 18K" and signed "Paloma Picasso." The earring backs are also marked with a maker's mark and "18K." They are in brand new condition and come complete in the original Tiffany & Co., velvet box, which is inside the classic, blue Tiffany & Co. cardboard box.

A very nice 18K yellow gold Sputnik style ring by H Stern. The dome is bezel-set with round citrines, amethysts, green tourmalines, pink tourmalines, garnets and aquamarines. This design was created in the 1950s to highlight the range of colored gemstones available from the mines of the jeweler’s native Brazil. It later came to be known as “Sputnik” for its resemblance to the spiky Soviet satellite lanched in 1957...

An elegant vintage 14K yellow gold and pearl brooch by Mikimoto. The stylized feather design is typical of Mikimoto’s vintage pieces and is particularly suitable for daytime wear. The pearls, ranging in size to 5.5 to 7.2 millimeters, have ivory body color with rose overtones and superb luster. The quality is estimated at A+1. The back of the pin is marked “K14” and bears the Mikimoto oyster shell hallmark.

Origin: Japan, ca. 1970. Condition: excellent, all original...

A vintage pair of Tiffany & Co. 18K yellow gold earrings in a classic ribbed shrimp design. The earrings have posts and omega backs. Marked "T&C 750".

Origin: America, ca 1980

Condition: excellent

Dimensions: 1" long; 3/8" maximum width

Weight: 14.9 grams

Lovely signed Mikimoto flower-form brooch in 18K yellow gold set with pearls. The flower petals are made up of very fine quality 6-6.5mm pearls, estimated at AA. The nacre is thick and very lustrous. The body color is white with green/rose overtones. The back of the pin is marked with Mikimoto’s hallmark and the gold content.

Origin: Japan, ca. 1990. Condition: mint. Size: 2-1/8” x 1-1/8”. Weight: 6.5 grams.

An elegant pair of 18K yellow gold earrings in Tiffany & Co.’s classic “Signature” pattern. The simple x-shaped design can be worn with everything from jeans to a cocktail dress. These earrings were produced in several sizes, these being the largest. The design is no longer in production and the large earrings are very difficult to find. The earrings retain their original posts and omega clips...

A classic pair of 18K yellow gold earclips by acclaimed jewelry designer Barry Kieselstein-Cord. The earrings are designed as rectangular plaques centering slightly domed centers surrounded by beaded borders...

A classic pair of 18K yellow gold earclips in the ROUND design by Elsa Peretti for Tiffany & Co. Peretti’s designs transform even the simplest geometric shapes into beautiful and original jewelry. The round shapes are adorned only with an off-center round “dent” that flattens the sphere. The eassings can be dressed up or down for wear with nearly any outfit. The backs are omega clips with posts. The earrings are signed by Peretti and Tiffany, and are presented in their original dark blue T...

An elegant pair of 18K yellow gold earrings with lapis lazuli inlay by Angela Cummings. The designer pioneered modern hardstone mosaic techniques when she was a lead designer at Tiffany & Co. She began working at Tiffany in 1967, but was not allowed to sign her own designs until 1974. These earrings are definitely her design, but are unsigned, indicating that they date from the period 1967-74. The earrings are marked “T&Co 18K”.

Origin: America, 1967-74. Size: 7/8” x 3/4". Weight: ...

A lovely vintage 18K yellow gold and diamond ring by Boucheron. The top of the band has a quilted ("matelassé) pattern accented with crossed bands set with brilliant round-cut diamonds (E/VVS2). The setting is heavy and quite comfortable to wear. The interior of the shank is signed “Boucheron” and is marked “Or 750 / 885513912”. The outside of the shank is stamped with the “tete d’aigle” mark and with Boucheron’s maker’s mark.

Origin: France, ca. 1990

Condition: excellent

This is a Vintage Tricolor Bracelet in like new condition. It sat in a safe for decades. Has a Harp Israel Stamp and is stamped 14K. Also has a second designer stamp we don't recognize. There is an appraisal from 1997 that gives it a value of $1900.00. Weighs 31.5 grams and is about 7 or 7.5 inches in length.

Gorgeous pair of signed Mikimoto 18K yellow gold, pearl and diamond earrings. Each earring features a cluster of five 6.0—6.5 mm pearls, topped with a golden bow and sprinkled with prong-set round brilliant-cut diamonds. The pearls have white body color with strong rosé overtones. The luster is bright and the surfaces are free of blemishes. The pearls are extra fine AAA—in other words, the absolute finest quality available anywhere in the world. The diamonds are of equally fine quality...

Large snake brooch made by Italian designer Piranesi. 18K black gold setting covered with amethysts, pink tourmaline, two approx 5 pt diamonds for eyes. The combination of these stones gives this brooch an overall stunning color, a real standout.