The Ultimate Diamond Buying Guide – Abtin & Company
Skip to content
Free Shipping on Orders Over $800


The Ultimate Diamond Buying Guide

The Ultimate Diamond Buying Guide - Abtin & Company

Purchasing a diamond is a significant investment, whether for an engagement ring, a special gift, or simply an addition to your jewelry collection. With so many factors to consider, it's easy to feel overwhelmed. This comprehensive guide will walk you through everything you need to know to make an informed and confident purchase.

Understanding the 4 Cs of Diamonds

The 4 Cs—Carat, Cut, Color, and Clarity—are the primary factors that determine a diamond's quality and value. Let's dive into each of these aspects in detail.

1. Carat

Carat refers to the weight of the diamond. One carat is equal to 200 milligrams. While carat weight influences the diamond's size, it's not the sole determinant of its value. Larger diamonds are rarer and thus more expensive, but other factors also play crucial roles.

Carat Weight Chart:

  • 0.25 carat: 4.1mm
  • 0.50 carat: 5.1mm
  • 0.75 carat: 5.8mm
  • 1.00 carat: 6.4mm
  • 1.50 carat: 7.4mm
  • 2.00 carat: 8.1mm

2. Cut

Cut is the only factor influenced by human hands and it refers to how well the diamond has been cut from its raw state. It affects the diamond's brilliance, sparkle, and overall aesthetic appeal. A well-cut diamond reflects light beautifully, enhancing its appearance.

Cut Grades:

  • Excellent: Maximizes the diamond's brilliance and sparkle.
  • Very Good: Offers high levels of brilliance and sparkle.
  • Good: Reflects most light but less brilliance.
  • Fair: Reflects some light, but much less than higher grades.
  • Poor: Lacks brilliance and sparkle.

3. Color

Color in diamonds actually refers to the lack of color. The more colorless a diamond, the higher its quality. The Gemological Institute of America (GIA) grades diamonds on a color scale from D (completely colorless) to Z (light yellow or brown).

Color Grades:

  • D-F: Colorless
  • G-J: Near Colorless
  • K-M: Faint Yellow
  • N-R: Very Light Yellow
  • S-Z: Light Yellow

4. Clarity

Clarity measures the presence of internal flaws (inclusions) and external blemishes. Most diamonds have imperfections, but many are not visible to the naked eye.

Clarity Grades:

  • FL (Flawless): No inclusions or blemishes visible under 10x magnification.
  • IF (Internally Flawless): No inclusions visible under 10x magnification.
  • VVS1, VVS2 (Very, Very Slightly Included): Inclusions are difficult to see under 10x magnification.
  • VS1, VS2 (Very Slightly Included): Inclusions are visible under 10x magnification but are minor.
  • SI1, SI2 (Slightly Included): Inclusions are noticeable under 10x magnification.
  • I1, I2, I3 (Included): Inclusions are obvious under 10x magnification and may affect transparency and brilliance.

Diamond Shapes

Diamonds come in various shapes, each with its unique characteristics and appeal. The most popular shapes include:

Round Brilliant

The round brilliant cut is the most popular and traditionally sought-after diamond shape. It maximizes sparkle due to its 58 facets.


The princess cut is a square-shaped diamond with pointed corners, known for its modern and stylish appearance.


The emerald cut is rectangular with stepped facets, offering a unique optical appearance and a vintage look.


The cushion cut has rounded corners and larger facets, which increase its brilliance. It has a romantic, vintage appeal.


The oval cut is an elongated shape that gives the illusion of greater size and enhances the diamond's brilliance.


The marquise cut has a distinctive, elongated shape with pointed ends, creating an illusion of greater size and a slender appearance.


The pear shape, also known as teardrop, combines the best of the oval and marquise cuts, offering a unique and elegant look.


The Asscher cut is similar to the emerald cut but is square with larger step facets, offering a deep, unique brilliance.


The radiant cut combines the stylish shape of the emerald cut with the brilliance of the round cut, featuring trimmed corners.


The heart shape is a romantic choice, symbolizing love and affection. It requires precision cutting to ensure symmetry.

Certification and Grading Reports

When buying a diamond, it's crucial to ensure it comes with a certification from a reputable grading laboratory. The certification verifies the diamond's quality based on the 4 Cs and provides assurance of its value. The most respected grading laboratories include:

GIA (Gemological Institute of America)

The GIA is widely regarded as the most trusted and accurate diamond grading laboratory. A GIA certificate provides a detailed assessment of the diamond's characteristics.

AGS (American Gem Society)

The AGS is another highly respected laboratory known for its strict grading standards. AGS certificates are highly valued for their precision.

EGL (European Gemological Laboratory)

The EGL is known for providing slightly more lenient grading, which can result in lower prices. However, this can sometimes lead to discrepancies in quality perception.

IGI (International Gemological Institute)

The IGI is a widely recognized laboratory, especially for diamonds sold in Asia and Europe. IGI certificates are reliable and trusted.

Ethical Considerations: Conflict-Free Diamonds

When purchasing a diamond, consider its ethical sourcing. Conflict diamonds, also known as blood diamonds, are mined in war zones and sold to finance armed conflict against governments. To ensure your diamond is conflict-free:

  • Look for Certification: Ensure the diamond comes with a certification that guarantees it is conflict-free.
  • Ask the Jeweler: Inquire about the diamond's origin and the jeweler's sourcing practices.
  • Support Ethical Brands: Purchase from brands committed to ethical sourcing and transparency.

Budgeting for a Diamond

Determining your budget is a critical step in the diamond buying process. Here are some tips to help you set and stick to a budget:

Prioritize the 4 Cs

Decide which of the 4 Cs is most important to you. For example, if size is a priority, you might opt for a larger carat weight with slightly lower color or clarity grades.

Compromise Wisely

Consider compromising on certain aspects to fit your budget. For instance, a near-colorless diamond (G-J) can be significantly less expensive than a completely colorless one (D-F) without a noticeable difference in appearance.

Consider Different Shapes

Some diamond shapes are less expensive than others. For example, round brilliant diamonds are typically more costly than princess or cushion cuts.

Shop Around

Compare prices from different jewelers and online retailers to find the best deals. Ensure you're comparing diamonds with similar specifications.

Tips for Choosing the Right Diamond

Choosing the right diamond involves more than understanding the technical aspects. Here are some practical tips to help you make the best choice:

Inspect the Diamond in Person

Whenever possible, view the diamond in person to assess its sparkle and brilliance. Online images may not accurately represent the diamond's true appearance.

Consider the Setting

The setting can significantly impact the diamond's appearance. A well-chosen setting can enhance the diamond's beauty and make it appear larger.

Evaluate the Diamond Under Different Lighting

Diamonds can look different under various lighting conditions. Evaluate the diamond under natural, fluorescent, and incandescent lighting to get a comprehensive view of its appearance.

Seek Expert Advice

Consult with a trusted jeweler or gemologist who can provide professional advice and answer any questions you may have.


Buying a diamond is a significant and exciting investment. By understanding the 4 Cs, considering different shapes, and prioritizing certification and ethical sourcing, you can make an informed and confident purchase. Remember to set a budget, compare options, and seek expert advice to find the perfect diamond that meets your needs and preferences.

Happy diamond shopping!

Thanks for subscribing!

This email has been registered!

Shop the look

Choose Options

Back In Stock Notification
this is just a warning
Shopping Cart
0 items