One issue however is that if the object is highly specular (eg mirror-like) then the reflections may confuse the stereo algorithm and give incorrect depth information. Specular surfaces will also bounce the laser light off in a direction where the cameras can't see it. This problem can however be solved by "dusting" the surface with something to provide a reflection, like talcum powder. There are also special sprays for laser scanning that can be used (these sprays are designed to wash off with water; for jewelry ultrasonic cleaning afterwards would work).
But if you have very fine jewelry the spatial resolution may not be adequate.
