Obsidian Gems

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BLACK OBSIDIAN Rough Rock Gem for Tumbler Polisher    US $45.75

R GREEN SHEEN OBSIDIAN OREGON 790Ct ORIGINAL GERMAN CUT TOP GEM GRADE JEWELRY    US $44.00

R MAHOGANY OBSIDIAN OREGON 183Ct ABSOLUTELY UNIQUE CUT BEST GEM GRADE JEWELRY    US $39.00

COFFEE OBSIDIAN Rough Rock Gem for Tumbler Polisher    US $36.99

9 Inch OBSIDIAN BOMB NEVADA SPECIMEN CRYSTAL GEM STONE GEMSTONE    US $29.99

27 Carat 23x17mm Cushion Cut TOP GEM VVS IF Neon Royal Blue VOLCANIC OBSIDIAN    US $24.99

1056ct 14mm Portuguese Round TOP GEM VVS IF Neon Royal Blue VOLCANIC OBSIDIAN    US $17.99

rare GEM MEXICAN RAINBOW OBSIDIAN HEART CAB    US $16.00

Natural Gemstone Wands You choose from Variety of gems Jewelry Collect Metaphysi    US $14.35

580ct 116mm Portuguese Round TOP GEM VVS IF Neon Royal Blue VOLCANIC OBSIDIAN    US $9.99

45mm natural obsidian round loose beads gem 155long    US $9.50

ONE 40x30 Oval Mahogany Obsidian Cabochon Gem Gemstone    US $8.99

MOST DEMANDED BEST 3300 CT NATURAL BLACK WHITE SNOW FLAKES OBSIDIAN GEM    US $8.99

One 40x30 Oval Snowflake Obsidian Cabochon Gem Gemstone    US $8.99

Rainbow Obsidian Gem Healing WORRY Pendant    US $8.90

3X Strands Snowflake Obsidian Gem 6 8 10mm Round Beads CHIC    US $8.29

3X Strands Snowflake Obsidian 6 8 10mm Round Gem Beads HOT    US $8.29

TEN 6mm Round Snowflake Obsidian Cabochon Gem Gemstone    US $6.99

12 6x4 Oval Snowflake Obsidian Cabochon Gem Gemstone    US $6.99

SIX 8 85mm Round Snowflake Obsidian Cabochon Gem    US $6.99

ONE 25mm Round Mahogany Obsidian Cabochon Gem Gemstone    US $6.99

1 30mm Round Mahogany Obsidian Cabochon Gem Gemstone    US $6.99

3 14mm Round Snowflake Obsidian Cabochon Gem Stone Gemstone    US $6.99

3 10mm Round Snowflake Obsidian Cabochon Gem Gemstone    US $6.99

25 Carats Oval Snowflake Obsidian Cabochon Gem Gemstone    US $6.99

12 5mm Round Snowflake Obsidian Cabochon Gem Gemstone    US $6.99

Black Obsidian 120Ct Natural Carved Cabochon Gem    US $6.32

450 Polished Gemstones Mix 25 Snowflake Obsidian Gem    US $6.00

450 Polished Gemstones Mix 25 Black Obsidian Gems    US $6.00

One 30x22 Oval Mahogany Obsidian Cabochon Gem Gemstone    US $5.99

Two 20x15 Oval Mahogany Obsidian Cabochon Gem Gemstone    US $5.99

2 20x15 Oval Snowflake Obsidian Cabochon Gem Gemstone    US $5.99

3X Strands Snowflake Obsidian Round 6 8 10mm Gem Beads FASHION    US $4.59

Cabochon Gem Snowflake obsidian 10x12 mm Oval Pkg 12    US $4.40

100 OBSIDIAN Polished Gems Lot 5mm Jet Black Color    US $4.00

100 SNOWFLAKE OBSIDIAN Polished Gems Lot 5mm Volcanic    US $4.00

Obsidian mahagoni KEYRING KEY RING HOLDER TUMBLE GEM STONE 1pc    US $2.00

Snowflake Obsidian KEYRING KEY RING HOLDER TUMBLE GEM STONE 1pc    US $2.00

325 CTNATURAL OVAL GRAY PATCH BLACK AFRICA SNOWFLAKE OBSIDIAN NR LOOSE GEM    US $.99

How much is my onyx or obsidian gem worth?

I have an black gem and I know its either onyx or obsidian but I'm not sure which. It's square square pyramid (the shape of an Egyptian pyramid) all 4 sides are about 3.5mm each. 2mm is the height. if someone could tell me how much it is worth that would be great.
oh and here are the details of it so someone might be able to figure out if its either Obsidian or Onyx.
-Black
-Smooth
-Light does NOT shine through it.
-Light reflects off of it

From your description it could be either. Obsidian is a volcanic glass so that's going to be a little smoother and shinier than onyx. Onyx is completely opaque.

They both would fall in the semi-precious gem category. I'd say the stone is worth no more than $20.

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Earthtones Organic Natural Jade and Black Obsidian Necklace