Jewelry New Arrivals Pairs Lots Contact
  : Gemstone - Window
Frequently Asked Questions (FAQ) / Windowed gems

How can I tell if a gem is "windowed"?

In a well-cut faceted gem, the pavilion facets (those on the lower half of the stone) should reflect light back out of the top (table) of the stone. If the facets are cut below the critical angle for the particular material, light will pass right through the stone instead of being reflected back toward the eye. When this happens the gem will lack sparkle and brilliance. Try holding your gemstone over a piece of paper with some text on it. Look down through the table of the gem. If you can read the text clearly through the gem, it has a window.

Return to FAQ HOME

  • First Published: February-20-2006
  • Last Updated: November-11-2014
  • © 2005-2016 all rights reserved.
    Reproduction (text or graphics) without the express written consent of (SETT Company Ltd.) is strictly prohibited.
English speaking customer support only

Toll Free - USA & Canada only:


Reorder Items

Save Money
No shipping Fees for Additional Items!
$6.99 Worldwide Shipping

GemSelect Gemstones
X Close Window
Colored Gemstones
X Close Window
Colored Gemstones
X Close Window
Colored Gemstones
Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart