Here is a note from Cinderhill, a company that sells beautiful hand made druzy cabochons and beads.
My husband and I have been involved in collecting, cutting and selling drusy/druzy stones for over 20 years.
As gem dealers we consistently have people who come to our booth and ask what is drusy? Although it has gained in popularity in the last number of years drusy is only found at a few retail shops.
I like to explain to people that the surface of a drusy stone is composed of “micro-crystals”. These tiny crystals cover the surface of the stone which reflects many points of light. That is the first thing that makes the drusy stone attractive to the eye, the sparkle. The small crystals might form on a surface of a rock or as the interior portion of a geode.
There are many types of drusy stones. There are natural drusy, which have not been altered in color. And now as popularity and demand have grown for this type of stone, many varieties of dyed, and plated drusy are now used in jewelry too.
The most common variety of natural drusy are micro quartz crystals over agate or massive quartz. The natural colors of quartz are clear, grey, blue (blue lace agate), purple (amethyst),orange (carnelian) or brown. Rarely pink or other shades of blue.
Garnet is one of the materials we cut as a drusy stone. Drusy garnets can be found in deep red (pyrope or almadine) brilliant green (uvarovite), peachy/pink (hessionite), greenish/brown (andradite), orange (spessartite) or black/brown (melanite). The crystals sometimes are a bit larger than the micro size mentioned, but nevertheless the crystals have grown together and provide the kind of sparkle that drusy is known for.
can also be found in mineral specimens of Pyrite. Pyrite is usually the color of “gold” but can also be found in rainbow pyrite and chalcopyrite with a multitude of other colors combined with the gold color.
Calcite forms in micro-crystals at times. Bright pink CobaltoCalcite looks unreal, but it displays colors from light pink to raspberry pink and many shades inbetween.
Other natural varieties of drusy are minerals such as; psilomelane, malachite, chrysocolla, hematite. The drusy in this case is generally crystalline quartz over the mineral taking on it’s rich coloring. Drusy Chrysocolla is one of the most popular and one of the hardest to come by of the natural drusy materials.
Dyed drusy stones are made from quartz. The quartz is dyed to resemble amethyst, chrysocolla, carnelian and any other color from nature’s palate that is attractive to the eye. The material that is dyed is very stable and typically does not wear off.
One other form of treatment used to color drusy stones is when a stone is exposed to a vaporized metal oxide. This is usually done in a vacuum chamber and the end result is extremely attractive. Therefore this type of treatment is now dominating the marketplace in the treated drusy stone segment.
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