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GIA 4Cs Diamond Blog

GIA 4Cs Diamond Blog

October Birthstone: What You Need to Know About Opal

Opal is the October birthstone – and its play-of-color is so mesmerizing that it borders on magical. From coveted black opal, to serene water opal, to blazing fire opal, there’s one for every taste. We help you find your favorite. (more…)

October Birthstone: Where Does Opal Come From?

Opal’s kaleidoscopic hues have delighted us for centuries. Loved for its spellbinding play-of-color, this October birthstone seems to be a bit magical and mysterious. Get ready to find out where it comes from – and how it forms. (more…)

April Birthstone: Diamond Jewelry Gift Ideas for an Aries

April Birthstone: Diamond Jewelry Gift Ideas for an Aries

Diamond is the April birthstone, and we have some stunning gift ideas for a loved one born in this month. We’ve spiced up our selections by turning to the zodiac sign for additional inspiration. So take a look at what we/ve picked – our April birthstone pieces are sure to please. (more…)

Famous Birthstone: October’s Sun-god Opal

There are three main types of opal: white, black and fire. Some precious opals emit spectral colors from every angle, each one quickly flashing and glowing as bright as the next. This phenomenon is called play-of-color and has enchanted people throughout the ages.

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Fire opal gemstone
Red Gemstone Buying Guide – Part 2

As passions ignite this month, a jewelry gift featuring a red gemstone is a token of love that can be enjoyed every day. While seen mostly in fashion jewelry, red gemstones are showing up as an option for the primary stone in engagement rings. Celebrities like Jessica Simpson, who sports a 5-carat ruby engagement ring, have been influential in bringing gemstones to the forefront of bridal trends. In addition to rubies, garnets and red diamonds, which we discussed yesterday, the following gemstones are more options for those looking to celebrate this Valentine’s Day with a gift of a spectacular red gem. (more…)

GIA Celebrates Birthstones – Opal’s Fiery Play-of-Color

Opal, October’s birthstone, is a captivating gemstone because of its unique optical characteristics. Opals often exhibit a spectrum of colors called “play-of-color,” when viewed from various directions. The Roman naturalist, Pliny the Elder, referred to opal’s play-of-color in the 1st century AD when he wrote: “For in them you shall see the living fire of ruby, the glorious purple of the amethyst, the sea-green of the emerald, all glittering together in an incredible mixture of light.” (more…)

All About Birthstones: Opal for October

October babies have the pleasure of enjoying two birthstones to commemorate their birthdays – tourmaline and opal. Last time we wrote about pink tourmaline, and now we’re going to share with you about opal. (more…)