Colours of Light

6,500 Kelvin - cool white (bluish daylight)
Cold white light is used to view gemstones under cooler lighting conditions. It can help to make certain colour nuances more clearly visible. For gemstones such as blue sapphires, tanzanites or blue topazes, this light can enhance their cooler depth of colour, but it can also produce a slightly bluish tint that affects the actual hue.

5,500 Kelvin - daylight white (neutral daylight)
Daylight white light is the preferred lighting in gemmology, especially at workstations where gemstones are graded. This light temperature simulates natural daylight, which enables precise colour assessment. It is ideal for detail work and colour measurements on gemstones such as diamonds, sapphires and emeralds and most pearls. Best colour contrast for bi-colour jewellery

4,000 Kelvin - neutral white (slightly yellowish daylight)
Neutral white light offers a good balance between warm and cool light colours and is suitable for general lighting in gemstone grading. It provides a balanced quality of light that displays gemstones neutrally and reproduces both warm and cool colours relatively unaltered. It shows yellow gold and gemstones such as tourmalines, quartz crystals or amethysts in a relatively neutral colour scheme.

3,000 Kelvin - warm white (incandescent lamp-like light)
Warm white light is rarely used in gemmology, as it makes gemstones appear in a yellowish light. This can make it difficult to assess colours accurately. However, warm white light could be useful when viewing Tahitian pearls and gemstones such as amber or opal to emphasise their warm tones. It can also be used in areas where a cosy atmosphere is desired, such as consultation or presentation rooms.

6,500 Kelvin - cool white (bluish daylight)
Cool white light can be beneficial for visually impaired people as it creates high contrasts, making it easier to recognise objects. However, some people find the bluish light straining on the eyes, so it should be used carefully and in suitable environments.

5,500 Kelvin - daylight white (neutral daylight)
Daylight white light can be helpful for visually impaired people as it provides bright and clear lighting. This makes it easier to recognise details and contrasts.

4,000 Kelvin - neutral white (slightly yellowish daylight)
Neutral white offers clear, high-contrast vision and can help visually impaired people to perceive their surroundings better without the light appearing too warm or too cool.

3,000 Kelvin - warm white (incandescent lamp-like light)
Warm white light can be pleasant for visually impaired people as it is less dazzling and creates a relaxed atmosphere. It can be used in living areas to create a cosy environment, especially in rooms that are not used for detail-oriented tasks, but rather for general activities and relaxation.

6,500 Kelvin - cool white (bluish daylight)
Cool white light is used in dental laboratories when a very clear and detailed view is required. This light colour is particularly useful for precision work and the recognition of fine details, such as in the manufacture of dental crowns. The cool and clear light quality supports the visibility of the finest differences in material colours and structures.

5,500 Kelvin - daylight white (neutral daylight)
In dental laboratories, daylight white is often used for workstations where precise colour comparison work is required, for example when fitting dental crowns or bridges. The clear, bright light supports precise vision and helps to better recognise details. Daylight white makes it possible to assess the colours of dental materials in daylight conditions, which leads to better results.

4,000 Kelvin - neutral white (slightly yellowish daylight)
Widely used in dental laboratories, 4,000 K creates a neutral light environment that facilitates the colour matching of dental restorations. It helps to correctly match the colours of natural teeth and dental prosthesis materials.

3,000 Kelvin - warm white (incandescent lamp-like light)
3,000 K is used to view materials and colours in a natural, warm light. This light colour is similar to traditional incandescent light and can help to show how tooth-coloured materials look under warm lighting conditions.