Diamond Cut Garnet

Are the Diamond probes used by jewlers 100% accurate? Can they mistake a rough diamond?
I have a rough stone that many feel is a diamond. I went to jewlers and there probe said no..I collect rocks and minerals and I have eliminated citrine,topaz,garnet and zircon-some of the hardest minerals known..My stone will not polish-sand or be cut by my dremel bits. In fact, it has ruined every bit I have tried. What else could it be?
No piece of equipment is 100% accurate but if you took it to a jewelers then they probably know. But take it to a certified gemologist to make sure.
Also, corundum is 9 on the Moh's scale so its just below diamond. Corundum comes in all colours.
Gatik Stainless Steel Diamond Cut Cufflinks
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1900's NATURAL ANTIQUE CUSHION CUT 4.05CT ANDRADITE GARNET DIAMOND RING PLATINUM $7,015.00 |
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Tsavorite Garnet Heart & Diamond Ring w/40 Round Cut Diamonds Solid 14kt. W.G. $4,750.00 |
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12 Carat Cushion Cut Rhodolite Garnet & Diamond Cocktail Ring 14K White Gold $3,299.00 |
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ESTATE 16.09CTW DIAMOND EMERALD CUT GARNET 14KT WHITE GOLD HALO BRACELET #B25886 $3,150.00 |
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Exceptional Emerald Cut Spessartite Garnet and Diamond Ring $3,030.00 |
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Platinum 4.90ctw Emerald Checkerboard Cut Garnet & Diamond Heavy Solitaire Ring $2,995.00 |
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Precision Cut 2.84ct Spessartite Garnet & Diamond Ring R3908 Diamonds by Lauren $2,549.00 |
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ESTATE FINE VIVID GREEN TSAVORITE GARNET 1.07CT FULL CUT DIAMOND .25CT RING $2,470.00 |
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FABULOUS ROSE CUT DIAMOND AND GARNET LONG EARRINGS $2,330.94 |
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Brazil Cushion Cut Garnet & Diamond 18K White & Yellow Gold Ring One Of $2,250.00 |