Sugilite Value, Price, and Jewelry Information

SUGILITE: Kuruman, South Africa (gem 3.66)

SUGILITE: Kuruman, South Africa (gem 3.66)

Sugilite Value

Sugilite Value via Gem Price Guide

FacetedAll sizes
to $⊝⊝⊝/ctPremium Data for Gold Members
CabochonsAll sizes
$⊝⊝⊝ to $⊝⊝⊝/ctPremium Data for Gold Members

Premium Data for Gold Members Gold Membership is required to see values from our Gem Price Guide

Sugilite Information

DataValue
NameSugilite
Crystallography Hexagonal; occurs as subhedral grains; massive.
Colors Light brownish yellow; lavender. intense reddish violet (manganiferous) purplish, dark rose-red.
Luster Vitreous.
Fracture Conchoidal
Hardness 6-6.5.
Toughness Good
Density 2.74 (variable).
Birefringence0.003—0.005.
Cleavage None; massive material tough.
Luminescence None
Spectral Strong band at 4190, weak band at 4110; broad diffuse band centered at 5700.
Wearability * Very Good
Special Care InstructionsAvoid rough handling
TransparencyTransparent to Opaque
Formula(K,Na)(Na,Fe+3)2(Li2Fe+3)lSi12O30+Mn
Pleochroism Not reported.

Optics: o=1.610; e=1.607 (India:  o= 1.595; e=

1.590: Africa: o= 1.610; e = 1.606).

Uniaxial (-).

Comments

Grape Jelly Purple,” is how the color of this gem is described. In spite of the popularity of that food in the US, the gem isn’’t very popular among consumers. Even sophisticated gem shoppers ignore this beautiful gem. Most sugilite sales are in Asia, very few in North America.

Sugilite was named for its discoverer, Professor Ken-ichi Sugi, a Japanese petrologist. He first discovered tiny crystals of the mineral in 1944. The location of this first discovery was the Iwagi Islet in Southwestern Japan.

The original Japanese materials were just tiny, yellow crystals with no gem value. In 1955 some dark pink crystals were found in India’s Central Province that were also identified as Sugilite. However, there were not cuttable either.

In 1975 a thin seam of Sugilite was found in a core-drill sample from a manganese mine, near Hotazel, South Africa. This material had enough manganese content to give it the deep purple coloring the gem is famous for. The deposit was small, but significant because it is the source of the first gem grade sugilite.

Exploratory mining continued and four years later a commercial sized deposit was found. It is estimated to contain as much as ten to twenty tons of sugilite. However, the deposit is 3,200 feet below the surface! With that technical limitation, combined with a small demand, most of it is still in the ground. What does come out has a high price for an opaque gem material, simply due to the difficulty of removing it from such a great depth.

So far, this is the only known deposit of gem grade sugilite. About half of it has the deep purple coloring that is considered gem grade. While almost all of it is opaque, a very tiny percentage, maybe 1/10 of 1% is translucent. Needless to say, this translucent, “Sugilite Gel” is extremely rare, expensive and highly prized.

When grading sugilite, the most important factor is its color with the deepest color recieving the highest grade. On close inspection you will see that the mineral is mottled. This does not effect the value, provided the overall color remains deep. If there are lighter areas, mixed in with the dark purple, then the value does begin to decline.

Sugilite is available in fairly large sizes. Gems over ten carats are common and no additional value is given to these sizes. Currently, top quality sugilite gems are wholesaling in North America for around $8 a carat. The retail price is usually between $16 and $25 a carat. The translucent sugilite isn’t available in sufficient quantities for market values to be established.

Name

After Professor Ken-ichi Sugi, the Japanese petrologist who first discovered the mineral. Royal Lavulite is named after the lavender color, Royal Azel from the locality, Hotazel.

Trade Names

Sugilite also called Royal Lavulite, Royal Azel

Source/Attribution: Dr. Joel Arem


Products and Services Directory

Looking for gemology related products and services? Visit our Products and Services Directory.

Scholarships

IGS seeks to encourage the advancement of students pursuing a higher education. Learn more about the 2014 Clark Scholarship.

eNews Signup

Membership Login