sapphire

Necklace with GIA-graded natural golden South Sea pearls, yellow diamonds, and yellow sapphires. Photo courtesy of liveauctioneers.com and…

This chevron pendant/necklace with freshwater pearls, rubies, emeralds, and sapphires in 14k yellow gold won the 1985 AGTA Spectrum Jewelry…

Rectangular step-cut ruby, 1.01 cts, 6.7 x 4.1 mm, untreated, Mozambique. © The Gem Trader. Used with permission.

Sapphires and rubies are both varieties of corundum. Just a trace of chromium in corundum will create ruby red color. Sometimes, natural gems form…

Rubies and sapphires are some of the most prized gemstones in the world and were also some of the first to be created in a laboratory. These synthetic…

Cubic zirconia (CZ) can be manufactured colorless or in almost any color, so it can simulate not only diamonds but also many colored gemstones.…

In the late 19th century, corundum — ruby and sapphire — became one of the first gemstones created in laboratories to have the size and quality…

Red spinels larger than one carat will sell for a premium, and Myanmar (Burma) traditionally produces the finest quality stones. A 3-ct red spinel…

Diamond and sapphire cluster ring. Photo courtesy of liveauctioneers.com and Fellows.