Add to ORKGThe variation of color in minerals makes the difference between a valuable gem and a worthless stone. So, naturally, there are many ingenious ways to manipulate that color. A mineralogist describes some of the possible pitfalls
Heat treatment of sapphires can produce a richer more vibrant color in this gem, but not for all sap...
Pleochroism plays an important role in determining the face-up visual color appearance of faceted, o...
Gemstones form in metamorphic, magmatic, and sedimentary rocks. In sedimentary units, these minerals...
The variation of color in minerals makes the difference between a valuable gem and a worthless stone...
Gems are well-compressed small pieces found in mineral deposits found inside earth. Pearls and amber...
In colored gems, minor and trace chemical components commonly determine the difference between a com...
Studies concerning the origin of color in gem materials have grown in sophistication in recent yea...
Diamonds, rubies, emeralds, jade, pearls—these are the seeds of many dreams (FIG. 1). Gems are assoc...
Advances in technology have brought great advances in our ability to impart color to natural gemst...
Gems have been used in the manufacture of jewellery and as ornaments since antiquity. Considering ge...
In its pure form, diamond is colorless. However, in nature (or even when made in laboratories), diam...
The previous two articles in this series described the origins of color in gems that derive from iso...
As is well known, pleochroism, or the varied colors exhibited by some minerals when examined in tran...
Pure feldspar, free of exsolution, is colorless. However, minor chemical substituents, inclusions, ...
This is the second part in a three-part series on the origin of color in gem materials. This article...
Heat treatment of sapphires can produce a richer more vibrant color in this gem, but not for all sap...
Pleochroism plays an important role in determining the face-up visual color appearance of faceted, o...
Gemstones form in metamorphic, magmatic, and sedimentary rocks. In sedimentary units, these minerals...
The variation of color in minerals makes the difference between a valuable gem and a worthless stone...
Gems are well-compressed small pieces found in mineral deposits found inside earth. Pearls and amber...
In colored gems, minor and trace chemical components commonly determine the difference between a com...
Studies concerning the origin of color in gem materials have grown in sophistication in recent yea...
Diamonds, rubies, emeralds, jade, pearls—these are the seeds of many dreams (FIG. 1). Gems are assoc...
Advances in technology have brought great advances in our ability to impart color to natural gemst...
Gems have been used in the manufacture of jewellery and as ornaments since antiquity. Considering ge...
In its pure form, diamond is colorless. However, in nature (or even when made in laboratories), diam...
The previous two articles in this series described the origins of color in gems that derive from iso...
As is well known, pleochroism, or the varied colors exhibited by some minerals when examined in tran...
Pure feldspar, free of exsolution, is colorless. However, minor chemical substituents, inclusions, ...
This is the second part in a three-part series on the origin of color in gem materials. This article...
Heat treatment of sapphires can produce a richer more vibrant color in this gem, but not for all sap...
Pleochroism plays an important role in determining the face-up visual color appearance of faceted, o...
Gemstones form in metamorphic, magmatic, and sedimentary rocks. In sedimentary units, these minerals...