"It is tough to tell the price since the clarity and color can't be determined, but based on what we can tell it could range anywhere from $20,000 to $40,000," Zaven says.
Also weighing in on Lauren's ring is celeb jewelry designer Jennifer Fisher (Rihanna, and Katie Holmes are fans), who tells E! News:
"Lauren's ring is quintessential timeless perfection when it comes to choosing a setting that will withstand the test of time. One quality about it that is exciting is that she has updated her gold color to yellow, where there has been a trend for the platinum bands recently."
Additional reporting by Ruth O'Neill
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