Gemstone Jewelry Description

FUR Jewelry insists on using the most advanced laboratory cultivation technology to ensure that every gemstone can achieve perfect color, transparency and purity. The following is a detailed introduction to the three gemstones we use and their production technology, parameters and other scientific data.

Ruby

Laboratory grown, heat-treated for optimization

Growing method:
The rubies we use are grown using the **Flame Fusion Method**. This method melts aluminum oxide (Al₂O₃) powder and then crystallizes it at high temperatures to form the same crystal structure as natural rubies. The flame fusion method allows for control of the purity and size of the gemstones, giving them superior optical properties.

Heat treatment:
To enhance the color of rubies, we heat treat them. The temperature is usually between 800°C and 1,800°C, and heat treatment makes the color of the gemstone more vivid and uniform.

Technical parameters:

Color range: Bright red to dark red (Cr2O3 concentration affects color)
Transparency: High transparency, few inclusions
Purity: Laboratory-grown rubies have very few inclusions and are generally purer than natural rubies
Refractive index: 1.762 - 1.770
Specific gravity: 3.97 - 4.05
Hardness: 9 (Mohs hardness)
Advantages:
Heat-treated rubies have a more uniform and lasting color, with almost no flaws or inclusions common in natural rubies.

Emerald

High-quality laboratory-grown

Growing method:
The emeralds used by FUR are produced through the **Hydrothermal Growth Method**, a high-tech process that simulates the high temperature and pressure environment in which natural emeralds are formed in the earth's crust. By controlling the temperature and pressure, the emerald crystals gradually grow in the solution, eventually forming a gemstone with a color and structure very similar to natural emeralds.

Technical parameters:

Color range: light green to dark green (the content of Fe and Cr affects the color)
Transparency: high transparency, few inclusions (usually fingerprint-shaped or needle-shaped inclusions)
Purity: purer than natural emeralds, with fewer cracks and impurities common in natural emeralds
Refractive index: 1.565 - 1.602
Specific gravity: 2.67 - 2.78
Hardness: 7.5 - 8 (Mohs hardness)
Advantages:
Laboratory-grown emeralds are more stable and do not require oil treatment (natural emeralds often require oil treatment to enhance transparency), so the visual effect is purer and more brilliant.

Sapphire

Laboratory-grown, deep color

Growing method:
The sapphires we use are also made by the **Flame Fusion Method**. This process is similar to ruby, and a crystal structure is formed by melting aluminum oxide powder. Trace amounts of titanium (Ti) and iron (Fe) are added during the cultivation process to produce the classic blue color.

Technical parameters:

Color range: Light blue to dark blue (determined by the ratio of Fe and Ti elements)
Transparency: High transparency, almost no inclusions
Purity: Sapphire inclusions are very few due to strict control of conditions in the laboratory
Refractive index: 1.762 - 1.770
Specific gravity: 3.95 - 4.03
Hardness: 9 (Mohs hardness)
Advantages:
Laboratory-grown sapphires have more uniform color distribution and superior optical properties, and can present pure blue without color zoning or inclusions commonly found in natural sapphires.

Lab-grown gemstones vs. natural gemstones: Professional comparison

1. Color control
Lab-grown gemstones achieve their color by adjusting the chemical element content and processing temperature, making the color more consistent and deep. The color of natural gemstones is limited by the natural environment, and the color distribution may be uneven.

2. Purity and inclusions
Laboratory gemstones are usually much purer than natural gemstones because the laboratory can precisely control the growth conditions to reduce or completely avoid inclusions. Natural gemstones often contain cracks, bubbles or other inclusions.

3. Environmental protection and sustainability
The production of lab-grown gemstones has less impact on the environment and does not require mineral mining, which is in line with the sustainable development concept advocated by FUR Jewelry.

Gemstone production flow chart

We combine science and technology to ensure that every gemstone can show the ultimate beauty and quality. To learn more about the scientific process behind gemstone production, please view our gemstone production flow chart.