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  <xsd:element id="ruby_DebtInstrumentPrepaymentRateTwo" name="DebtInstrumentPrepaymentRateTwo" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="ruby_DebtInstrumentPrepaymentRateOne" name="DebtInstrumentPrepaymentRateOne" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="ruby_DebtInstrumentPrepaymentRateThree" name="DebtInstrumentPrepaymentRateThree" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="ruby_TermLoanMember" name="TermLoanMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="ruby_DebtInstrumentNumberOfTranche" name="DebtInstrumentNumberOfTranche" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="ruby_DebtInstrumentDebtDefaultAdditionalInterestRate" name="DebtInstrumentDebtDefaultAdditionalInterestRate" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <xsd:element id="ruby_IncreaseDecreaseOperatingLeaseRightOfUseAsset" name="IncreaseDecreaseOperatingLeaseRightOfUseAsset" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="ruby_IncreaseDecreaseOperatingLeaseLiabilities" name="IncreaseDecreaseOperatingLeaseLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="ruby_ServiceBasedStockOptionsMember" name="ServiceBasedStockOptionsMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="ruby_AccruedExpensesAndOtherCurrentLiabilitiesExcludingCurrentOperatingLeaseLiabilities" name="AccruedExpensesAndOtherCurrentLiabilitiesExcludingCurrentOperatingLeaseLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="ruby_AccruedManufacturingFacilityExpensesCurrent" name="AccruedManufacturingFacilityExpensesCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="ruby_AtMarketOfferingMember" name="AtMarketOfferingMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="ruby_MaximumAggregateOfferingPriceOfStock" name="MaximumAggregateOfferingPriceOfStock" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <xsd:element id="ruby_CommissionsAsPercentageOfGrossOfferingProceeds" name="CommissionsAsPercentageOfGrossOfferingProceeds" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <xsd:element id="ruby_AccruedGeneralAndAdministrativeExpensesCurrent" name="AccruedGeneralAndAdministrativeExpensesCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="ruby_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFourAndThereafter" name="LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFourAndThereafter" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="ruby_ManufacturingEquipmentMember" name="ManufacturingEquipmentMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="ruby_PrincipalAmountToBeFundedPerTrancheMember" name="PrincipalAmountToBeFundedPerTrancheMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="ruby_OfferingMember" name="OfferingMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="ruby_PrincipalAmountToBeFundedPerTrancheSecondAmendmentIncludingAdditionalLimitMember" name="PrincipalAmountToBeFundedPerTrancheSecondAmendmentIncludingAdditionalLimitMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="ruby_LendersMember" name="LendersMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="ruby_DebtInstrumentFundedPerTranche" name="DebtInstrumentFundedPerTranche" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="ruby_TwoThousandAndEighteenCreditFacilityAmendmentMember" name="TwoThousandAndEighteenCreditFacilityAmendmentMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
</xsd:schema>
