A Gemological Institute of America (GIA), American Gem Society (AGS), or International Gemological Institute (IGI) diamond certificate assures the value and quality of your diamond. GIA, AGS, and IGI are the gold standard in diamond grading. Their reports detail key characteristics of each diamond.

Tiêu chuẩn 4C của kim cương thiên nhiên bao gồm Carat (trọng lượng), Color (màu sắc), Clarity (độ tinh khiết) và Cut (giác cắt), đây là những tiêu chuẩn đánh giá của Viện Ngọc học Hoa Kỳ (GIA). Kim cương 4Cs đều được phân loại cụ thể dựa trên những thông số kim cương này.

Diamond shape refers to the geometric appearance of a diamond. Diamond shapes are categorized into two groups: round diamonds and fancy shape diamonds. Round diamonds, also known as round brilliant cuts, are the most traditional diamond shape. Fancy shape diamonds refer to any diamond that is not a round brilliant. Tiffany fancy shape diamonds include princess, cushion, emerald, oval, pear, marquise, heart and our exclusive Tiffany True® diamond.

It’s important to note that diamond cut and diamond shape are not the same thing. A diamond’s cut determines how its facets interact with light. A shape describes the geometric appearance of a diamond. Cut defines what the shape of a rough diamond will be—not the other way around.
This is why diamond shapes are often interchangeably referred to as cuts.

The cut of a diamond shape ultimately determines its ability to sparkle. This is largely because cut determines the number of facets on a diamond and how light travels through the stone. Facets are the flat, polished surfaces on a diamond. Like tiny mirrors, each facet is precisely cut and proportionally arranged to maximize the diamond’s ability to gather in and reflect light. While cut quality is the most important factor behind a diamond’s sparkle, color and clarity grades also matter. The higher the color and clarity grades, the brighter the diamond.

All Tiffany diamonds are exceptionally cut to maximize brilliance. However, each diamond shape has its own unique cut and faceting style which produces varying degrees of brilliance. There are three different diamond cuts used to craft every diamond shape: brilliant cut, step cut and mixed cut.

A GIA diamond is really shorthand diamond sellers use to describe diamonds that have been graded by GIA. GIA is an independent, nonprofit organization that conducts gem research, educates gem professionals and sets the standards for determining diamond quality. One of GIA’s main functions is the grading of diamonds. You may have already heard or learned about the 4Cs of diamond quality: color, clarity, cut and carat weight. GIA created this standard, along with the scientific procedures for evaluating each “C” and the grading terminology used to describe them.
GIA does not mine diamonds, nor does it buy, sell or trade them commercially. It doesn’t appraise diamonds and is not otherwise involved in diamond pricing or valuation. GIA operates independently of these commercial interests, ensuring that its diamond quality assessments are completely objective and unbiased.

Triple X diamond is a trade term for round brilliant diamonds that have been graded by GIA as having Excellent cut, Excellent symmetry and Excellent polish. X is short for Excellent, so Triple X really just means Triple Excellent.

A diamond’s cut, symmetry and polish grades indicate the quality of craftsmanship that went into transforming a diamond rough into a polished stone. All three affect a diamond’s interaction with light and are described on GIA Diamond Grading Reports as Excellent, Very Good, Good, Fair, to Poor.

Many diamond buyers seek out Triple Excellent diamonds because they want diamonds with the best possible craftsmanship. Top notch craftsmanship ensures that a diamond gives off maximum light and fire while having an attractive pattern.

Fluorescence is the glow you sometimes see when an object emits visible light. Some diamonds fluoresce when they are exposed to ultraviolet (UV) rays from sources like the sun and fluorescent lamps. This can cause them to emit a bluish light or more rarely, a yellow or orangy light. Once the UV light source is removed, the diamond stops fluorescing.

If you view Tierra diamond listing, each diamond is accompanied by a GIA number below its photo. Clicking on it will bring you directly to the GIA website where a digital version of the certificate is hosted. This is uploaded directly by GIA and cannot be manipulated by any 3rd parties like diamond shops.

You can also access the same page from GIA’s Report Check to validate that the information on your physical certificate matches what is archived in the GIA report database. This method can be done swiftly and conveniently – all you need to enter is the diamond’s GIA number. With the online archive, it is impossible to falsify documents.

With each Tierra order, you will receive the original (printed) GIA certificate for your purchased diamond but you can also download a digital copy in PDF format from GIA’s website.