There are no named varieties or species of Montana sapphire. There are rare star sapphires found in the Montana deposits, and the sapphires from Yogo Gulch are so famous that they are often referred to as “Yogo Sapphires.”
Are Montana sapphires valuable?
To be specific, the majority is under 1/2ct and a very limited supply of the sapphires are over 1ct, which makes the stone substantially more expensive per carat. Typical Montana sapphire can cost anywhere from $250-$1500 per carat for under 1/2ct to upwards of $7000 per carat for larger than 5 carats.
What is special about Montana Sapphire?
A durable stone with excellent toughness, it also ranks nine on the Mohs scale of hardness. Montana sapphire is not likely to scratch or chip, making it a great choice for daily wear. High heat could damage the stone’s color or clarity.
What makes Montana sapphires different?
One of the most striking differences between Montana Sapphires and Sapphires from other areas of the world is their color. Sapphires from Montana are unique in that they naturally occur in light pastels, unique blue-greens, and smoky grays. So, a Montana Sapphire could be a calming bathwater green or a sky blue-grey.
Are all Montana sapphires from Montana?
Montana is known as the Treasure State because it is rich in many mineral and gemstone sources, including two types of sapphires: the Yogo Sapphire from the central area of the state, and Fancy Montana Sapphires found mostly in the western half of the state.
Where can I dig for Montana sapphires?
Montana’s many colored sapphires are mined in the famous placer gravels in the Sapphire Mountains near Philipsburg about 200 miles northwest of Yellowstone National Park. Most of the sapphires are found in the famed Rock Creek deposit, nicknamed “Gem Mountain.” Gold miners discovered sapphires there in the 1890’s.
How much is a 1 carat sapphire worth?
Sapphires can come as cheap as $25 per carat, to over $11,000 per carat. A blue sapphire around 1 carat is likely to cost from as little as $450 to $1,600, depending on quality.
How rare are Montana sapphires?
Considering that a rough nugget will yield a cut stone only about 1/3 of the original size means that large, fine quality faceted Montana sapphires are very rare. It is uncommon to see a fine quality faceted Montana sapphire weighing over 2 carats, gems over 3 carats are extremely rare.
How much are Yogo sapphires worth?
Because of their fine quality, the price differential between Yogo and other fancy Montana sapphires can be significant. Baide said that other Montana sapphires can average about $1,000 per carat, compared with somewhere around $10,000 per carat for a Yogo sapphire.
How can you tell if a sapphire is real or not?
The Fog Test
If you’re looking at a sapphire and want to confirm it’s authenticity, just breath on it for a second. On real sapphires, the fog from your breath will evaporate very quickly (~2 seconds). If it’s fake, it may take 5 seconds or more to start evaporating and 2-3 seconds to actually evaporate.
Are Yogo sapphires only found in Montana?
Yogo Sapphires are the only sapphires in Montana still being mined from the primary deposit. Yogo sapphire are typically cornflower blue, a result of small amounts of iron and titanium. They have high uniform clarity and maintain their brilliance under artificial light.
Why are Yogo sapphires so expensive?
While it is estimated that 5.6 tons (or 28 million carats) of Yogo Sapphires are still in the ground, the excavation of them is costly and difficult, which keeps their scarcity and relative price high. … Anything in the neighborhood of 1 carat or above will be very expensive.
What kind of rock are Yogo sapphires found in?
They are found in a system of igneous intrusions called dikes. There are six main dikes that form the centre of the Yogo sapphire deposit. All are composed of a type of igneous rock called a lamprophyre.
Where are most sapphires found?
Sapphires can be found all over the world, but the majority of the finest blue sapphires are mined in Sri Lanka. Since 2016, Madagascar has also been a prominent location for sapphire mining, and other popular locations include Montana, Australia, and Tanzania.
Are Montana sapphires treated?
Most Montana sapphires undergo heat treatment to deepen pale color or to give color to colorless stones. When heated under oxidizing conditions, these gems often become bright yellow.
What gems can you find in Montana?
These include: jasper, garnet, varieties of quartz, rhodonite, serpentine, staurolite, topaz, tourmaline, and wonderstone. A few diamonds, diamond indicator minerals, and kimberlites have been found in the state.