Enormous gold nugget could top $100K at Heritage Auctions Aug. 18

This 11-inch-long ‘Lightning Bolt’ gold nugget is considered to be rarer than any diamond, according to Heritage Auctions. Heritage Auctions image

DALLAS – An enormous, 40-ounce gold nugget, nicknamed Lightning Bolt for its bright yellow glow, could take top lot honors in in Heritage Auctions’ Nature & Science Auction Aug. 18. The 11-inch nugget was discovered in Victoria, Australia, and experts have deemed the remarkable find a museum-quality specimen. Absentee and Internet live bidding is available through LiveAuctioneers.

Weighing 39.9 troy ounces (43.8 ounces, or 1,241 grams), the gold nugget (above; estimate: $70,000-$100,000) is an absolute rarity, because of its size and aesthetic appearance, said Craig Kissick, Heritage Auctions’ Nature & Science director.

“The fact that the vast majority of all gold produced has been melted down for its pure content makes a nugget like this one even more impressive. Nuggets like this are far more rare than diamonds.”

A set of five Tourmaline crystals from Paprok (Papruk Mine; Paprowk Mine) in the Kamdesh District, Nuristan Province in Afghanistan (estimate: $30,000-$50,000) is a spectacular group from Paprok, a known source for exceptional specimens. Presented in matte sterling silver bases, this quintet (below) of slender crystals offers vivid color, superb luster and excellent terminations, with each pillar – they range in height from 3 to 5 inches – exhibiting sidecar clusters of other minerals. The crystals are so aesthetically appealing that they can be displayed as a group or individually.

This set of five tourmaline specimens is an outstanding representation for the material from the famous Paprok localityin Afganistan. Each is presented in a matte sterling silver base. Heritage Auctions image

Azurite, calcite, smithsonite and massive clouds of tarnowitzite comprise a complex cluster that carries an estimate of $20,000-$30,000 – figures that very well could prove to be conservative. This specimen is from the world-renowned Tsumeb mine in Namibia.

This unusually complex mineral association features azurite, calcite, and smithsonite, as well as massive clouds of tarnowitzite, a variety of aragonite. It is nearly 5 inches long. Heritage Auctions image

As one of the “big three” gemstones, a 7.44-carat sapphire from Myanmar (estimate: $20,000-$30,000) grabs the attention of collectors immediately. Cut in a cushion shape with a modified brilliant-cut crown and step-cut pavilion, the stone is unheated and GIA-certified. The blue color includes areas of violet.

This 7.44-carat sapphire from Myanmar is cut in a cushion shape with a modified brilliant-cut crown and step-cut pavilion. Heritage Auctions image

The size, alone, of a 36.04-carat Imperial topaz from Brazil (estimate: $20,000-$30,000) is enough to demand immediate attention, but this oval-shaped stone also boasts a rich, golden honey color that is saturated and exhibits areas of darker orange. The brilliant cut allows it to light up and present an abundance of scintillation.

From the Ross C. Lillie collection of Illinois minerals comes this fluorite from Minerva No. 1 Mine in the Cave-in-Rock Sub-District of Hardin County in Illinois (estimate: $20,000-$30,000). Weighing 4.4 pounds (2 kilograms) and measuring 6 inches across the face, this specimen of well-formed cubes features rich colors, striking phantoms inside the major crystals and excellent luster over the rather clear fluorite cubes.

Out of the Ross C. Lillie collection of Illinois minerals comes this museum-quality fluorite with prominent phantoms of golden-yellow inside massive cubic crystals bordered in purple and blue. Heritage Auctions image

Other top lots include:
– Fossil palm frond – Green River Formation – Wyoming: $20,000-$25,000.
– Seymchan meteorite end cut – Magadanskaya Oblast, Russia: $10,000-$15,000.
– Megalodon shark tooth – Pliocene – Lower Yorktown Formation – Lee Creek Mine, Aurora, North Carolina: $5,000-$7,000.