Not knowing much on the company, and being curious in nature, I figured I'd do some research on them and share it here.
This post is merely a compilation of information that I have found in books and online. There are some far more in depth articles out there. See the bottom of this post for links.
Bogoff jewelry that I have found usually has a style and construction that consists of silver or rhodium plated pieces, paste set rhinestones, and either clip or screw-back earrings. The majority of the pieces that I find are made with clear rhinestones, though I have seen pieces with pale blue in person, and have found pieces with other colors online.
Though the rhinestones are paste set, which in many circles is a code word for "cheaply made," the pieces from Bogoff are consistently high quality pieces with gorgeous design.
|Bogoff Up Ear Earrings by Pink Astilbe Vintage at Etsy|
The Bogoff company name is often connected online and in books with "Spear Novelty Company" in Chicago. However, Carroll points out in her Collecting Costume Jewelry 202 book that "the 1955 Jewelrs' Buyers Guide lists the company as Jewels by Bogoff located in Chicago, Illinois, with no mention of Spear Novelty." (page 151)
Various sites around the internet and in several books have varying dates for the end of the company, with the majority of sites claiming that the company closed in the late 1950s, though one claims the company was producing jewelry all the way until the 1970s.
|Bogoff Necklace by Pink Astilbe at Etsy|
Other great images of Bogoff Jewelry can be found at Morning Glory Antiques. There they have a fantastic collection of vintage jewelry advertisements for Bogoff jewelry.