Gemstone Education

Sapphire: More Than Blue

Sapphire belongs to the corundum family. Blue is its best-known color, but sapphires also occur in a range of other colors. Red corundum is called ruby.

With Mohs hardness 9, corundum is resistant to scratching, but the condition, treatment, and setting of an individual stone still matter when considering care and wear.

Start with an exact identification

A blue stone is not automatically sapphire. Read the complete laboratory conclusion rather than relying only on the seller's color description.

If the material is described as natural or synthetic, keep that designation visible in the item record.

Heating and other treatment questions

Treatment information is an important part of many sapphire enquiries. Ask whether the report addresses the treatment claim relevant to your decision and how the result should be interpreted.

A statement about heating should not be expanded into a conclusion about every possible process. Read the comments as well as the headline identification.

Special colors and optical effects

Some sapphires are described with particular trade terms or display phenomena such as a star. Those descriptions should be considered in the context of the actual item and the report's wording.

Ask whether an appealing product name is a laboratory designation or the seller's own language.

Geographic origin

If a country is emphasized in the sales description, request the evidence supporting it. Identification, treatment assessment, and geographic origin are distinct questions, even when a report includes more than one of them.

Compare stones in a consistent way

Record the material identification, dimensions, weight, treatment wording, and any origin conclusion. View the actual items under comparable conditions where possible.

Then consider the color and appearance you prefer, the planned setting, and any practical care questions. A good comparison keeps the technical description and personal preference connected.