Seha Diamond

About Us

Seha Diamond is a diamond house based in Cağaloğlu, Istanbul, one of the city’s historic centres of jewellery and precious stone trading. We offer a carefully selected catalogue of certified and uncertified diamonds, presented with detailed technical information so that customers can compare stones clearly and make more informed decisions.

Choosing a diamond is not only about appearance. Carat weight, color, clarity, cut, measurements, depth, table percentage, fluorescence, symmetry, polish and laboratory certification can all influence a diamond’s character, performance and value. For this reason, Seha Diamond focuses on presenting diamonds in a transparent, structured and easy-to-compare format.

Our catalogue is designed for individual buyers, jewellery professionals and anyone looking for diamonds in Istanbul with clear specifications and direct personal communication. Depending on availability, our stock may include diamonds graded by internationally recognized laboratories such as GIA, IGI and HRD, as well as uncertified diamonds described with detailed specifications.

Transparency in Certified Diamonds

One of the most important advantages of a certified diamond is that its characteristics have been evaluated by an independent gemological laboratory.

For certified diamonds listed by Seha Diamond, we aim to display the report number, grading laboratory and key technical characteristics openly whenever available.

International laboratories such as GIA, IGI and HRD assess diamonds according to measurable criteria such as carat weight, color, clarity, cut quality and other proportions. This allows buyers to evaluate a stone using both the seller’s listing and an independent laboratory report.

Depending on the stone, our listings may include information such as:

This structure allows customers to compare diamonds not only visually, but also through objective technical data.

GIA, IGI and HRD Certified Diamonds

Independent laboratory reports play an important role in the international diamond market. Seha Diamond may offer stones graded by laboratories including GIA, IGI and HRD.

GIA certified diamonds are accompanied by reports issued by the Gemological Institute of America, one of the best-known gemological institutions in the world. A GIA report documents key diamond characteristics and provides buyers with an independent reference point.

IGI certified diamonds are also widely used across the international jewellery and diamond industry and provide detailed grading information.

HRD certified diamonds are well known particularly within the European diamond market and are commonly used in professional diamond trading.

When a diamond is listed with a certificate number, the report can generally be checked directly through the official verification system of the relevant laboratory.

Uncertified Diamonds

Not every diamond on the market is accompanied by an independent laboratory certificate. Uncertified diamonds remain an important part of professional diamond trading and can be suitable for different budgets and purposes.

At Seha Diamond, uncertified diamonds are also presented with as much technical detail as possible. Rather than showing only a basic description, we aim to provide information such as carat weight, color, clarity, shape, measurements and other available characteristics.

For customers comparing certified and uncertified diamonds, we can also provide additional information about the differences between these options and help explain which type may be more suitable for a particular requirement.

What We Consider When Evaluating a Diamond

Carat weight alone does not determine the quality or appearance of a diamond. Two diamonds with the same carat weight can look very different and can also vary significantly in price.

The four best-known diamond characteristics are commonly referred to as the 4Cs.

Carat

Carat refers to the weight of a diamond. A higher carat weight generally means a larger stone, but size alone does not determine overall value.

Color

Diamond color grades indicate how colorless or tinted a diamond appears. In white diamonds, lower visible color can have a significant influence on rarity and market value.

Clarity

Clarity describes the internal and external characteristics of a diamond. Natural inclusions and surface features can occur during the formation of the stone, and clarity grades help describe their visibility and significance.

Cut

Cut has a major influence on the way a diamond interacts with light. A well-proportioned diamond can reflect and return light more effectively, contributing to brilliance and overall visual performance.

In addition to the 4Cs, factors such as symmetry, polish, fluorescence, depth, table percentage and measurements may also be important when comparing diamonds.

Different Diamond Shapes

The Seha Diamond catalogue may include diamonds in a variety of shapes and cutting styles.

Round Brilliant is one of the most popular and widely recognized diamond shapes. Its symmetrical design and light performance make it a common choice for solitaire rings and classic jewellery.

Oval diamonds offer an elongated appearance and can create an elegant visual effect.

Cushion cut diamonds combine a square or rectangular outline with softer, rounded corners.

Princess cut diamonds are known for their modern, geometric appearance and are often chosen by customers who prefer a square shape.

Our available stock may change over time, and different shapes, sizes and specifications can be added to the catalogue as inventory changes.

Diamonds in Istanbul

Istanbul has been an important centre for jewellery, precious stones and international trade for centuries. Areas such as Cağaloğlu, the Grand Bazaar and the surrounding districts have long been associated with jewellery and gemstone commerce.

Seha Diamond’s office is located in Cağaloğlu, allowing us to serve customers from one of Istanbul’s traditional jewellery districts.

Customers searching for diamonds in Istanbul can browse our online catalogue before visiting, compare technical specifications and contact us directly regarding specific stones.

An Online Catalogue with Personal Service

The Seha Diamond website is designed as a diamond catalogue and communication platform, rather than a conventional online checkout store.

When you find a diamond that interests you, you can contact us directly through WhatsApp or our other communication channels. We can provide current availability, additional details and, where possible, further images or information about the stone.

Because diamond inventories can change quickly, we recommend confirming availability before making a decision about a specific stone.

Why We Publish Technical Information

We believe transparency is important when comparing diamonds.

A buyer should not have to rely only on a photograph or a short marketing description. Technical specifications can provide valuable information about a stone and make it easier to compare different options.

For this reason, our product pages are designed to show as much relevant information as possible.

Our aim is to help customers:

For Individual Buyers and Jewellery Professionals

Seha Diamond serves both private customers and professionals working in the jewellery and diamond trade.

By listing diamonds with different carat weights, colors, clarity grades, shapes and certificates in one catalogue, the website also provides a practical way for professional users to compare available stock.

If you are looking for a diamond with specific characteristics, you can contact us and ask about current availability.

What Affects Diamond Prices?

Diamond prices are influenced by many factors. Two diamonds with the same carat weight may have very different prices because their other characteristics are not identical.

Factors that can influence diamond pricing include:

For this reason, comparing diamonds only by carat weight can be misleading. A more complete evaluation considers the stone’s overall combination of characteristics.

Certificate Verification

When considering a certified diamond, checking the report number can provide an additional level of transparency.

If a diamond listed by Seha Diamond includes a GIA, IGI or HRD report number, you can usually verify that report through the official website of the relevant laboratory.

This allows the grading information to be checked independently.

Our Cağaloğlu Office

Seha Diamond is located in Fatih, Istanbul, in the Cağaloğlu district.

Our address:

Hobyar, Cağaloğlu Yokuşu Sok. No:28, Office 102, 34112 Fatih / Istanbul, Türkiye

If you would like to visit our office and see specific diamonds, we recommend contacting us in advance. This allows us to check current availability and prepare the stones you are interested in.

Contact Seha Diamond

You can contact Seha Diamond for detailed information about any diamond in our catalogue, certificate details, current availability or specific requests regarding carat, color, clarity, shape or grading laboratory.

You can reach us through WhatsApp, phone or our website contact form.

Our goal is to provide customers looking for certified diamonds in Istanbul, GIA diamonds, IGI diamonds, HRD diamonds, loose diamonds and uncertified diamonds with a transparent catalogue, detailed technical information and direct personal communication.

For Seha Diamond, the purpose of the catalogue is simple: to make it easier to understand, compare and discuss diamonds before making an important decision.

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