What are sun spangles in amber?

Sun spangles in amber refer to natural inclusions that are created by the presence of tiny bubbles within the resin as it polymerizes. These bubbles can scatter light in such a way that they generate a sparkling or shimmering effect when viewed under light. This phenomenon adds visual interest and beauty to amber pieces, enhancing their appeal in jewelry and collectibles. Understanding the formation of these inclusions is crucial for distinguishing top-quality amber, as the presence of sun spangles can be a sought-after characteristic among collectors.

The other choices do not accurately describe sun spangles. Circular marks left from the heating and oiling process refer to alterations made post-formation rather than natural inclusions. Defects caused by exposure to sunlight are not related to the inherent characteristics of amber and do not form the distinctive patterns associated with sun spangles. Lastly, while patterns can indeed be formed during the geological processes that create amber, sun spangles specifically denote the effect of gas bubbles within the resin, making the original choice the most precise definition.