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452STONES | NATURAL - EMERALDNATURAL STONES EmeraldSPECIES: BerylHARDNESS: 7.5-8TOUGHNESS: Poor to goodENHANCEMENT: OREFRACTIVE INDEX: 1.577-1.583OPTIC CHARACTER: DRSPECIFIC GRAVITY: 2.72PHENOMENA: Chatoyancy (Rare)CLARITY TYPE: IIIQUALITY:C: Very opaque, highly included, yellow oxide stains, black inclusionsA: Dark green, heavily included, opaque, low brillianceAA: Medium green, moderate inclusions, medium brillianceAAA: Rich green, moderately to slightly included, high brillianceREACTIONSUltrasonic: RiskySteamer: NeverHeat: Very poor; should never be heatedChemicals: Hydrofluoric acidSOURCES: United States, Zambia, Brazil, Zimbabwe, Madagascar, Pakistan, India, Afghanistan and RussiaCARE & HANDLINGAvoid cleaning in solutions that may remove the oil. Wipe with clean soft cloth. Avoid situations that involve sharp harsh blows to the jewelry that may fracture or chip the stone or contact with rough surfaces or abrasive materials that may scratch the stone. Avoid prolonged exposure to light and/or heat that may cause oil to be removed or dry up. Stones may be retreated with oil by an experienced professional.HISTORY: Emeralds symbolized love and rebirth in ancient cultures. It is said to give mental power and wisdom and can make a person speak charismatically. As a power stone, it offers physical, emotional and spiritual balance. These stones were one of the first to be mined back in ancient times.STYLE #: EM-[SIZE CODE]-SQP-[QUALITY]SIZE CODE MM SIZE A AA0300 3.00mm $131.58 $244.800400 4.00mm $268.80 -STYLE #: EM-[SIZE CODE]-OCE-[QUALITY]SIZE CODE MM SIZE A AA0503 5x3mm $108.36 -0604 6x4mm $259.20 -0705 7x5mm $532.80 $905.250907 9x7mm - $1,900.56STYLE #: EM-[SIZE CODE]-SQS-[QUALITY]SIZE CODE MM SIZE A AA0150 1.50mm $13.35 $24.240175 1.75mm $19.50 $44.160200 2.00mm $22.47 $55.200225 2.25mm $30.90 $92.880250 2.50mm $38.64 $129.000275 2.75mm $46.38 $149.400300 3.00mm $78.96 $244.80PRINCESS SQUARE STEP-CUTEMERALDA AA A AAA AASTYLE #: EM-[SIZE CODE]-HTF-[QUALITY]SIZE CODE MM SIZE C A0300 3.00mm $18.30 $38.640400 4.00mm $33.12 $111.450500 5.00mm $57.42 -HEARTC AFor information on additional sizes and shapes of gemstones offered, please contact ourGemstone Department at 1-800-354-9833 or visit QGold.com for our user friendly stone finder.