Below are some examples and price guides of aventurine brooches including an leaf shaped brooch and a beetle brooch.

AVENTURINE QUARTZ, CULTURED PEARL AND DIAMOND LEAF BROOCH
The aventurine quartz carved to depict a leaf, decorated with 5.5mm-6.5mm cultured pearls and a brilliant-cut diamond, length 5.1cm

Sold for £892.50 inc. premium at Bonhams in 2021

Duck-shaped carved aventurine quartz, round ruby,18k yellow gold (French marks), signed Cartier Paris maker’s mark (Cartier, Société Anonyme), numbered

Size/Dimensions: 4.2 x 2.6 cm
Gross weight: 12.9 grams

Sold for EUR 10,080 at Christie’s in 2023

A beetle brooch set with aventurine quartz, in a naturalistic design with central aventurine quartz cabochon, with brooch pin to the reverse, stamped ‘750’, measuring 34 x 25mm. Total weight 6.8g.

Sold for £120 at Dawsons Auctioneers in 2023

A VINTAGE AUSTRIAN AVENTURINE QUARTZ, ROCK CRYSTAL, GREEN TOURMALINE AND DIAMOND FLOWER BROOCH in 14ct yellow gold, designed as a floral bouquet, the flowers formed of carved aventurine quartz and frosted rock crystal, the rock crystal flowers set to the centre with a round cut green tourmaline, the aventurine quartz set with a round brilliant cut diamond, the stems accented by rose cut diamonds, Austrian assay marks, 8.5cm, 28.3g.

Sold for £500 at Elmwood’s in 2023

Seaman Schepps Gold and Fluted Aventurine Quartz Clip-Brooch
18 kt., one fluted aventurine quartz ap. 50.0 x 49.0 mm., signed Seaman Schepps, with maker’s mark.

Sold for US$1,800 at Doyle New York in 2023

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Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, they occur in other colors, including gray and black, and they can be colorless. A pinkish orange variety of sapphire is called padparadscha. Reference: Wikipedia

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Emeralds, like all colored gemstones, are graded using four basic parameters–the four Cs of connoisseurship: color, clarity, cut and carat weight. Normally, in the grading of colored gemstones, color is by far the most important criterion. However, in the grading of emeralds, clarity is considered a close second. A fine emerald must possess not only a pure verdant green hue but also a high degree of transparency to be considered a top gem.

n the 1960s, the American jewelry industry changed the definition of emerald to include the green vanadium-bearing beryl. As a result, vanadium emeralds purchased as emeralds in the United States are not recognized as such in the UK and Europe. In America, the distinction between traditional emeralds and the new vanadium kind is often reflected in the use of terms such as “Colombian emerald”. Reference: Wikipedia

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Cultured pearls have been farmed and foreign material introduced to form the pearl. Cultured pearls can be distinguished from natural pearls by X-ray examination. Nucleated cultured pearls are often ‘preformed’ as they tend to follow the shape of the implanted shell bead nucleus. After a bead is inserted into the oyster, it secretes a few layers of nacre around the bead; the resulting cultured pearl can then be harvested in as few as six months.

When a cultured pearl with a bead nucleus is X-rayed, it reveals a different structure to that of a natural pearl. A beaded cultured pearl shows a solid center with no concentric growth rings, whereas a natural pearl shows a series of concentric growth rings. A beadless cultured pearl (whether of freshwater or saltwater origin) may show growth rings, but also a complex central cavity, witness of the first precipitation of the young pearl sac. Reference: Wikipedia

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Diamonds occur in a variety of colors—steel gray, white, blue, yellow, orange, red, green, pink to purple, brown, and black. Colored diamonds contain interstitial impurities or structural defects that cause the coloration, whilst pure diamonds are perfectly transparent and colorless. Diamonds are scientifically classed into two main types and several subtypes, according to the nature of impurities present and how these impurities affect light absorption: Reference: Wikipedia

A diamond’s worth is based on a number of various factors. To dispel arguments about a diamond’s worth – the diamond industry professionals use a set of particular guidelines which help establish the exact quality and desirability of a diamond. These guidelines, or the 4 C’s, were established by the Gemological Institute of America and are the basis of diamond value estimation. They include: Carat, Color, Clarity, Cut.  Reference: Worthy Living

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