Glass, enamel, and bronze work by Louis Comfort Tiffany (1848–1933) goes on the auction block at Bonhams, Christie’s, and Sotheby’s this week. The auction houses will receive some help from the exhibition “Louis Comfort Tiffany and Laurelton Hall: An Artist’s Country Estate,” which opened last month at the Metropolitan Museum of Art. The show could have explosive effects on this week’s sales.

“The Met show will have a major impact on the Tiffany glass market, which has been on an endless upward incline since the 1990s,” the 20th-century design director at Sotheby’s, James Zemaitis, said.

The Met exhibit features about 250 pieces — including stained-glass windows, paintings, and ceramics — from Tiffany’s Long Island home. The Oyster Bay estate burned to the ground in 1957, but many design elements were saved. Meanwhile, a show of Tiffany glass tiles and mosaics opened Tuesday at the Lillian Nassau Gallery on 57th Street.

The market for Tiffany wares has undergone a profound shift over the last decades. In the 1970s and 1980s, his pieces were bought by collectors focused exclusively on Louis Comfort Tiffany. “Now [collectors of] American paintings, and 20th-century design collectors as well, are snapping up Tiffany glass,” Mr. Zemaitis said. With more collectors (including Brad Pitt) and a diminishing supply, prices have jumped.

Lloyd Macklowe’s Macklowe Gallery on Madison Avenue has an inventory of more than 100 Tiffany lamps. He has seen a sharp recent rise in prices. “Five years ago, a 22-inch ‘Peony’ lamp cost $175,000 to $200,000,” he said. “Now that’s priced at $375,000 to $425,000.”

Tiffany leaded-glass lamps are especially prized. Christie’s “Magnificent Tiffany” auction on Monday includes an unusually magnificent 1920 bronze floor lamp. Its leaded glass shade depicts a magnolia tree in full flower. The piece is estimated to sell for between $1 million and $1.5 million. “The provenance is impeccable,” the 20th-century Decorative Art and Design specialist at Christie’s, Jeni Sandberg, said. “It has remained in the same family since 1920.”

Ms. Sandberg, too, sees the influence of the Met show as an impetus for Tiffany collecting. “Collectors will pay a premium for great objects associated with Laurelton Hall, but the problem is scarcity,” she said. Laurelton Hall is considered by Tiffany experts to be his greatest creation. The estate was extravagant, with 84 rooms on eight levels, stables, tennis courts, greenhouses, and an art gallery, chapel, and studio. Japanese, Islamic, and American Indian art were on display there. Built in 1902, the estate covered 600 acres. Though elements salvaged from the fire can be seen at the Met, very few items make it to auction. Still, some pieces find their way to sale. Two 1905 wrought iron chandeliers from Laurelton Hall are for sale at Christie’s. Each bears a $50,000–$70,000 estimate. And Tiffany’s personal copy of “The Art Work of Louis C. Tiffany,” a 1914 book by Charles de Kay with embossed gilt covers and signed by Tiffany, will likely be fought over. “We’ve had clients practically cry over the sight of the book from his Laurelton Hall library,” Ms. Sandberg said. She called the $30,000–$50,000 estimate “conservative.”

Tiffany also worked as an interior decorator for the wealthy from Manhattan to California. Ms. Sandberg said many collectors also seek out pieces from these commissions. The Christie’s auction features a particularly rare item from the designer’s pivotal interior commission: the Upper East Side home of sugar magnate Henry Havemeyer. It is a staircase balustrade section, 54 inches wide in bronze and Favrile (a type of iridescent glass Tiffany trademarked in 1894 that has never been duplicated to this day). Ms. Sandberg said she expects it to reach between $150,000 and $200,000.

Over at Sotheby’s, Mr. Zemaitis said he is sure that bidders will fight for a Tiffany 24-light “Lily” ceiling lamp at the “American Renaissance” sale tomorrow. Each glass shade of the 1900 lamp is shaped like a single blossom. Versions of Lily lamps with three, seven, and eight separate lights are practically common, but this item is highly unusual. “Maybe only one or two other 24-light chandeliers exist,”Mr. Zemaitis said.

At its 20th Century Decorative Arts sale Saturday, Bonhams is touting two Tiffany lamps, including a “Dragonfly” table lamp. Its glass shade depicts the insect in a blaze of color, and its bronze base is shaped like cattails. The lamp is estimated at between $80,000 and $100,000.”They cost under $300 a piece around 1902,” the 20th Century Decorative Arts specialist at Bonhams, Frank Maraschiello, said. “And that was a huge amount of money then.” On Saturday, one lamp could make more than 300 times the original price.

Tiffany mosaics and lamps also abound at the Lillian Nassau Gallery, owned by Arlie Sulka. Her first show, “Tiffany Glass Tiles and Mosaic Treasures,” which marks the gallery’s 60th anniversary, contains the largest such offerings ever.

“His mosaics rarely come on the market,” Ms. Sulka said. The designer’s firm produced the mosaics for interiors such as the Veterans Room at the Seventh Regiment Armory on Park Avenue. Ms. Sulka is selling mosaic panels for prices than range between $3,500 and $75,000. And a vast marble fireplace mantel embedded with twinkling mosaics from a 1902 Cleveland bank costs $125,000.

If those items are too pricey, mosaic tesserae (single mosaic units) and glass pendants cost only $100–$2,750. But those prices, like those of other Tiffany wares, won’t stay put. “They will go up in value,” Ms. Sulka said.