Sterling Silver 6x4 mm Lab-Grown White Opal & Natural London Blue Topaz 16-18" Necklace

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Our staff members are Gemological Institute of America graduates, and as such, heartily recommends GIA's expert and scientific knowledge.

Askew Jewelers recommends:

• GIA's jewelry care guidelines and tips.
• GIA's diamond (and gemstone) care and cleaning guide.
• GIA's pearl care and cleaning guide.

Askew Jewelers recommends GIA's sizing tips and guides.

All of Askew Jewelers' ring sizes are in the U.S. standard.

We are not currently able to resize rings before they are shipped.

The Gemological Institute of America (GIA) is the controlling authority on scientific methods and procedures for objectively grading a diamond’s quality. You can read about the 4Cs and GIA's history here.

• Diamond Color Explanation
• Diamond Clarity Explanation
• Diamond Cut Explanation
• Diamond Carat Weight (CTW) Explanation

Birthstones are gemstones that are associated with each month of the year and many believe each stone has unique properties and significance, making them popular choices for jewelry and gifts.

Discover each month's birthstone(s) and everything else you could wish to know about any birthstone by clicking here.