The object shown is a 
crystal or glass candle holder, designed to hold a candle upright. Similar items are identified as holders for stick, tea light, or votive candles. 
Description
  • Material: The item appears to be made of clear crystal or heavy glass.
  • Design: It is a single piece featuring a faceted or cut pattern around the base and a smooth upper section.
  • Functionality: The top likely features a cup suitable for placing various sizes of candles, such as tea lights or votives, or potentially a taper candle. 
Potential Brands and Information
  • Similar designs can be found from various brands, including BLOCK crystal, Baccarat, and Miller Rogaska