IMPORTANT NOTE: This item contains fissure filled cavities that may contain glass, cobalt, or other materials. Due to the presence of these materials, this item should be referred to as a composite stone.

 

 

 

STAR RUBY STONE

 

Birthstone for  July

 

This is a   red /purple stone showing a strong star .

 

Oval shape

Mohs scale 9

Grading eye clean

Heat treated and Glass filled.

 Weight  3.20 ct

Size  9 x 8 x 3 mm app

Note we have taken the photo in the sun as this gives the best display of the star

 

 

A Ruby is a pink to blood-red gemstone  a variety of the mineral corundum (aluminium oxide]. The common red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. Prices of rubies are primarily determined by color. The brightest and best "red" called pigeon blood-red, commands a huge premium over other rubies of similar quality. After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like rutile inclusions will indicate that the stone has been treated one way or another. Cut and carat (size) also determine the price

 

TREATMENTS

 

The most common treatment is the application of heat. Most if not all rubies at the lower end of the market are heat treated on the rough stones to improve color, remove purple tinge, blue patches and silk. These heat treatments typically occur around temperatures of 1800°C (3300°F).Some rubies undergo a process of low tube heat, when the stone is heated over charcoal of a temperature of about 1300°C (2400°F) for 20 to 30 minutes. The silk is only partially broken as the color is improved.

Type 1 Gemstones The following gemstones are typically inclusion free, even minor inclusions detract from their value. Diamond, Amethyst, Beryls(Aquamarine,Morganite), Citrine, Smoky Quartz, topaz, Chrysoberyl, Kunzite, Tanzanite, green Tourmaline, and Blue Zircon IF Internally flawless under extreme magnification (Very rare) F Flawless VVS Minute inclusions under 10x; invisible to the unaided eye VS Minor inclusions under 10x; usually invisible to the unaided eye SI1 Noticeable inclusions under 10x; usually visible to the unaided eye SI2 Noticeable inclusions under 10x; usually quite visible to the unaided eye I1 prominent- moderate affect on appearance or durability I2 prominent - severe affect on appearance or durability I3 prominent- severe affect on beauty, transparency or durability Type 2 Gemstones Gemstones that normally have small inclusions that do not detract from value. Alexandrite, Andalusite, Iolite, Peridot, Rhodolite, Ruby, Sapphire, Spinel, Tourmaline, Garnet, Amethyst, Red Zircon, Tsavorite; Blue, Orange, Purple, Fluorite.Yellow and Parti-colored Tourmaline F Flawless VVS Minor inclusions under 10x; usually invisible to the unaided eye VS Noticeable inclusions under 10x; often invisible to the unaided eye SI1 Obvious inclusions under 10x; visible to the unaided eye SI2 Obvious inclusions under 10x; very apparent to the unaided eye I1 prominent - moderate affect on appearance or durability I2 prominent - severe affect on appearance or durability I3 prominent - severe affect on beauty, transparency or durability